{
  "anes_dem_2024": {
    "ci": [
      53,
      57.7
    ],
    "ciLevel": 0.95,
    "display": "55.3%",
    "estimand": "weighted Democratic share of the major-party presidential vote",
    "n": 3515,
    "note": "",
    "period": "2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of the two-party presidential vote",
    "value": 55.3268,
    "weights": "weight_postelection (VCF9999)"
  },
  "both_chg_anes": {
    "display": "17.7",
    "estimand": "1992 share who split minus 2024 share",
    "note": "",
    "period": "1992 to 2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 17.6501,
    "weights": "none (summary of the yearly estimates)"
  },
  "cert_dem_2024": {
    "display": "49.2%",
    "estimand": "certified Democratic share of the Democratic and Republican presidential votes",
    "note": "",
    "period": "2024",
    "population": "all states and the District of Columbia",
    "source": "state-returns",
    "unit": "percent of the two-party presidential vote",
    "value": 49.2499,
    "weights": "none (full counts)"
  },
  "drh_1972": {
    "ci": [
      3.4,
      5.7
    ],
    "ciLevel": 0.95,
    "display": "4.6%",
    "estimand": "weighted share who voted Democratic for president and Republican for the House",
    "n": 1293,
    "note": "",
    "period": "1972",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 4.56303,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "drh_1996": {
    "ci": [
      10.9,
      15.8
    ],
    "ciLevel": 0.95,
    "display": "13.4%",
    "estimand": "weighted share who voted Democratic for president and Republican for the House",
    "n": 926,
    "note": "",
    "period": "1996",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 13.3695,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "drh_2020": {
    "ci": [
      5.8,
      7.8
    ],
    "ciLevel": 0.95,
    "display": "6.8%",
    "estimand": "weighted share who voted Democratic for president and Republican for the House",
    "n": 5167,
    "note": "",
    "period": "2020",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 6.78604,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "drh_2024": {
    "ci": [
      2.2,
      3.8
    ],
    "ciLevel": 0.95,
    "display": "3.0%",
    "estimand": "weighted share who voted Democratic for president and Republican for the House",
    "n": 3515,
    "note": "",
    "period": "2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 2.97382,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "drop_h_1972_2024": {
    "ci": [
      22.2,
      27.5
    ],
    "ciLevel": 0.95,
    "display": "24.9",
    "estimand": "decrease in the weighted share who split, 1972 minus 2024 (two separate samples)",
    "n": 4808,
    "note": "",
    "period": "1972 to 2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 24.8537,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "drop_h_1992_2024": {
    "ci": [
      15,
      20.3
    ],
    "ciLevel": 0.95,
    "display": "17.7",
    "estimand": "decrease in the weighted share who split, 1992 minus 2024 (two separate samples)",
    "n": 4641,
    "note": "",
    "period": "1992 to 2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 17.6501,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "drop_h_2008_2012": {
    "ci": [
      4,
      9.8
    ],
    "ciLevel": 0.95,
    "display": "6.9",
    "estimand": "decrease in the weighted share who split, 2008 minus 2012 (two separate samples)",
    "n": 4723,
    "note": "",
    "period": "2008 to 2012",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 6.91509,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "drop_h_2020_2024": {
    "ci": [
      5.1,
      8.2
    ],
    "ciLevel": 0.95,
    "display": "6.7",
    "estimand": "decrease in the weighted share who split, 2020 minus 2024 (two separate samples)",
    "n": 8682,
    "note": "",
    "period": "2020 to 2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 6.66238,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "ftf_chg_2012_2016": {
    "ci": [
      -4.8,
      3.1
    ],
    "ciLevel": 0.95,
    "display": "−0.9",
    "estimand": "difference in weighted shares who split, 2016 minus 2012 (separate samples)",
    "n": 1684,
    "note": "",
    "period": "2012 to 2016, in-person respondents, president and House",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": -0.869865,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "ftf_drop_2008_2012": {
    "ci": [
      2.1,
      9.4
    ],
    "ciLevel": 0.95,
    "display": "5.7",
    "estimand": "decrease in the weighted share who split among in-person respondents, 2008 minus 2012 (two separate samples)",
    "n": 2287,
    "note": "",
    "period": "2008 to 2012, in-person respondents",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 5.72483,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "ftf_drop_2016_2024": {
    "ci": [
      1,
      8.8
    ],
    "ciLevel": 0.95,
    "display": "4.9",
    "estimand": "decrease in the weighted share who split, 2016 minus 2024 (two separate samples)",
    "n": 1198,
    "note": "",
    "period": "2016 to 2024, in-person respondents",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 4.89347,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "house_all_div_1992": {
    "display": "30.6%",
    "estimand": "share of divided counties, all returns that pass rules 1 to 3",
    "n": 2843,
    "note": "",
    "period": "1992",
    "population": "counties with House returns, uncontested races included",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 30.6367,
    "weights": "none (full counts)"
  },
  "house_all_div_2024": {
    "display": "2.7%",
    "estimand": "share of divided counties, all returns that pass rules 1 to 3",
    "n": 3017,
    "note": "",
    "period": "2024",
    "population": "counties with House returns, uncontested races included",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 2.65164,
    "weights": "none (full counts)"
  },
  "house_between_1992": {
    "display": "89%",
    "estimand": "share of the vote-weighted mean square of the gap that is the district mean gap, corrected by n/(n-1)",
    "n": 2348,
    "note": "",
    "period": "1992",
    "population": "counties wholly inside one contested House district, in districts with at least two such counties",
    "source": "county-returns",
    "unit": "percent of the mean square",
    "value": 88.6266,
    "weights": "none (full counts)"
  },
  "house_between_2024": {
    "display": "83%",
    "estimand": "share of the vote-weighted mean square of the gap that is the district mean gap, corrected by n/(n-1)",
    "n": 2277,
    "note": "",
    "period": "2024",
    "population": "counties wholly inside one contested House district, in districts with at least two such counties",
    "source": "county-returns",
    "unit": "percent of the mean square",
    "value": 83.136,
    "weights": "none (full counts)"
  },
  "house_between_hi": {
    "display": "94%",
    "estimand": "highest yearly corrected share of the mean square of the gap that is the district mean gap",
    "note": "",
    "period": "1992-2024",
    "population": "counties wholly inside one contested House district, in districts with at least two such counties",
    "source": "county-returns",
    "unit": "percent of the mean square",
    "value": 93.6652,
    "weights": "none (full counts)"
  },
  "house_between_lo": {
    "display": "82%",
    "estimand": "lowest yearly corrected share of the mean square of the gap that is the district mean gap",
    "note": "",
    "period": "1992-2024",
    "population": "counties wholly inside one contested House district, in districts with at least two such counties",
    "source": "county-returns",
    "unit": "percent of the mean square",
    "value": 82.1005,
    "weights": "none (full counts)"
  },
  "house_between_raw_hi": {
    "display": "94%",
    "estimand": "highest yearly share of the mean square that is the district mean gap, without the n/(n-1) correction",
    "note": "",
    "period": "1992-2024",
    "population": "counties wholly inside one contested House district, in districts with at least two such counties",
    "source": "county-returns",
    "unit": "percent of the mean square",
    "value": 94.4952,
    "weights": "none (full counts)"
  },
  "house_between_raw_lo": {
    "display": "84%",
    "estimand": "lowest yearly share of the mean square that is the district mean gap, without the n/(n-1) correction",
    "note": "",
    "period": "1992-2024",
    "population": "counties wholly inside one contested House district, in districts with at least two such counties",
    "source": "county-returns",
    "unit": "percent of the mean square",
    "value": 84.309,
    "weights": "none (full counts)"
  },
  "house_cov_2024": {
    "display": "81%",
    "estimand": "share of the presidential two-party votes of the 48 contiguous states cast in the main House sample",
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of presidential two-party votes",
    "value": 81.3426,
    "weights": "none (full counts)"
  },
  "house_cov_hi": {
    "display": "84%",
    "estimand": "highest yearly share of the presidential two-party votes of the 48 contiguous states cast in the main House sample",
    "note": "",
    "period": "1992-2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of presidential two-party votes",
    "value": 83.8195,
    "weights": "none (full counts)"
  },
  "house_cov_lo": {
    "display": "71%",
    "estimand": "lowest yearly share of the presidential two-party votes of the 48 contiguous states cast in the main House sample",
    "note": "",
    "period": "1992-2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of presidential two-party votes",
    "value": 70.7026,
    "weights": "none (full counts)"
  },
  "house_dem_rep_1992": {
    "display": "276",
    "estimand": "count of counties won by the Democrat for president and the Republican for the House",
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "counties",
    "value": 276,
    "weights": "none (full counts)"
  },
  "house_dem_rep_1996": {
    "display": "466",
    "estimand": "count of counties won by the Democrat for president and the Republican for the House",
    "note": "",
    "period": "1996",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "counties",
    "value": 466,
    "weights": "none (full counts)"
  },
  "house_dem_rep_2020": {
    "display": "47",
    "estimand": "count of counties won by the Democrat for president and the Republican for the House",
    "note": "",
    "period": "2020",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "counties",
    "value": 47,
    "weights": "none (full counts)"
  },
  "house_dem_rep_2024": {
    "display": "27",
    "estimand": "count of counties won by the Democrat for president and the Republican for the House",
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "counties",
    "value": 27,
    "weights": "none (full counts)"
  },
  "house_div_1992": {
    "display": "31.0%",
    "estimand": "share of counties whose presidential winner differs from the House winner",
    "n": 2735,
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 31.042,
    "weights": "none (full counts)"
  },
  "house_div_2008": {
    "display": "26.6%",
    "estimand": "share of counties whose presidential winner differs from the House winner",
    "n": 2661,
    "note": "",
    "period": "2008",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 26.6065,
    "weights": "none (full counts)"
  },
  "house_div_2012": {
    "display": "9.7%",
    "estimand": "share of counties whose presidential winner differs from the House winner",
    "n": 2609,
    "note": "",
    "period": "2012",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 9.65887,
    "weights": "none (full counts)"
  },
  "house_div_2016": {
    "display": "7.7%",
    "estimand": "share of counties whose presidential winner differs from the House winner",
    "n": 2427,
    "note": "",
    "period": "2016",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 7.74619,
    "weights": "none (full counts)"
  },
  "house_div_2020": {
    "display": "3.0%",
    "estimand": "share of counties whose presidential winner differs from the House winner",
    "n": 2884,
    "note": "",
    "period": "2020",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 3.01664,
    "weights": "none (full counts)"
  },
  "house_div_2024": {
    "display": "2.8%",
    "estimand": "share of counties whose presidential winner differs from the House winner",
    "n": 2695,
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 2.82004,
    "weights": "none (full counts)"
  },
  "house_early_hi": {
    "display": "31.0%",
    "estimand": "highest yearly share of divided counties, House",
    "note": "",
    "period": "1992-2008",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 31.042,
    "weights": "none (full counts)"
  },
  "house_early_lo": {
    "display": "25.5%",
    "estimand": "lowest yearly share of divided counties, House",
    "note": "",
    "period": "1992-2008",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 25.4538,
    "weights": "none (full counts)"
  },
  "house_fall_0812": {
    "display": "16.9",
    "estimand": "2008 share of divided counties minus 2012 share, House",
    "note": "",
    "period": "2008 to 2012",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percentage points",
    "value": 16.9477,
    "weights": "none (full counts)"
  },
  "house_fall_1992_2024": {
    "display": "28.2",
    "estimand": "1992 share of divided counties minus 2024 share, House",
    "note": "",
    "period": "1992 to 2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percentage points",
    "value": 28.222,
    "weights": "none (full counts)"
  },
  "house_late_hi": {
    "display": "9.7%",
    "estimand": "highest yearly share of divided counties from 2012 on, House",
    "note": "",
    "period": "2012-2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 9.65887,
    "weights": "none (full counts)"
  },
  "house_mad_1992": {
    "ci": [
      14.5,
      18.7
    ],
    "ciLevel": 0.95,
    "display": "16.4",
    "estimand": "vote-weighted mean absolute difference between the House margin and the presidential margin",
    "n": 2735,
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "points of margin",
    "value": 16.3574,
    "weights": "presidential two-party votes in the county"
  },
  "house_mad_2024": {
    "ci": [
      3.2,
      4.2
    ],
    "ciLevel": 0.95,
    "display": "3.7",
    "estimand": "vote-weighted mean absolute difference between the House margin and the presidential margin",
    "n": 2695,
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "points of margin",
    "value": 3.69775,
    "weights": "presidential two-party votes in the county"
  },
  "house_r_1992": {
    "ci": [
      0.56,
      0.72
    ],
    "ciLevel": 0.95,
    "display": "+0.65",
    "estimand": "vote-weighted correlation between the county presidential margin and the House margin",
    "n": 2735,
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "correlation coefficient, from -1 to +1",
    "value": 0.649108,
    "weights": "presidential two-party votes in the county"
  },
  "house_r_2008": {
    "ci": [
      0.76,
      0.86
    ],
    "ciLevel": 0.95,
    "display": "+0.82",
    "estimand": "vote-weighted correlation between the county presidential margin and the House margin",
    "n": 2661,
    "note": "",
    "period": "2008",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "correlation coefficient, from -1 to +1",
    "value": 0.817669,
    "weights": "presidential two-party votes in the county"
  },
  "house_r_2012": {
    "ci": [
      0.93,
      0.96
    ],
    "ciLevel": 0.95,
    "display": "+0.95",
    "estimand": "vote-weighted correlation between the county presidential margin and the House margin",
    "n": 2609,
    "note": "",
    "period": "2012",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "correlation coefficient, from -1 to +1",
    "value": 0.949844,
    "weights": "presidential two-party votes in the county"
  },
  "house_r_2020": {
    "ci": [
      0.98,
      0.99
    ],
    "ciLevel": 0.95,
    "display": "+0.99",
    "estimand": "vote-weighted correlation between the county presidential margin and the House margin",
    "n": 2884,
    "note": "",
    "period": "2020",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "correlation coefficient, from -1 to +1",
    "value": 0.987941,
    "weights": "presidential two-party votes in the county"
  },
  "house_r_2024": {
    "ci": [
      0.987,
      0.992
    ],
    "ciLevel": 0.95,
    "display": "+0.99",
    "estimand": "vote-weighted correlation between the county presidential margin and the House margin",
    "n": 2695,
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "correlation coefficient, from -1 to +1",
    "value": 0.989664,
    "weights": "presidential two-party votes in the county"
  },
  "house_rep_dem_1992": {
    "display": "573",
    "estimand": "count of counties won by the Republican for president and the Democrat for the House",
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "counties",
    "value": 573,
    "weights": "none (full counts)"
  },
  "house_rep_dem_1996": {
    "display": "226",
    "estimand": "count of counties won by the Republican for president and the Democrat for the House",
    "note": "",
    "period": "1996",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "counties",
    "value": 226,
    "weights": "none (full counts)"
  },
  "house_rep_dem_2020": {
    "display": "40",
    "estimand": "count of counties won by the Republican for president and the Democrat for the House",
    "note": "",
    "period": "2020",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "counties",
    "value": 40,
    "weights": "none (full counts)"
  },
  "house_rep_dem_2024": {
    "display": "49",
    "estimand": "count of counties won by the Republican for president and the Democrat for the House",
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "counties",
    "value": 49,
    "weights": "none (full counts)"
  },
  "house_rest_1992": {
    "display": "29.9%",
    "estimand": "share of counties that are divided, rest of the country",
    "n": 1528,
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested House race in every district part, outside the Census South region",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 29.9084,
    "weights": "none (full counts)"
  },
  "house_rest_2004": {
    "display": "22.2%",
    "estimand": "share of counties that are divided, rest of the country",
    "n": 1494,
    "note": "",
    "period": "2004",
    "population": "counties in the 48 contiguous states with a contested House race in every district part, outside the Census South region",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 22.1553,
    "weights": "none (full counts)"
  },
  "house_rest_2012": {
    "display": "11.2%",
    "estimand": "share of counties that are divided, rest of the country",
    "n": 1480,
    "note": "",
    "period": "2012",
    "population": "counties in the 48 contiguous states with a contested House race in every district part, outside the Census South region",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 11.2162,
    "weights": "none (full counts)"
  },
  "house_rest_2016": {
    "display": "9.6%",
    "estimand": "share of counties that are divided, rest of the country",
    "n": 1424,
    "note": "",
    "period": "2016",
    "population": "counties in the 48 contiguous states with a contested House race in every district part, outside the Census South region",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 9.62079,
    "weights": "none (full counts)"
  },
  "house_rest_2024": {
    "display": "2.7%",
    "estimand": "share of counties that are divided, rest of the country",
    "n": 1575,
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part, outside the Census South region",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 2.73016,
    "weights": "none (full counts)"
  },
  "house_rms_1992": {
    "display": "27.0",
    "estimand": "vote-weighted root mean square of the House margin minus the presidential margin",
    "n": 2348,
    "note": "",
    "period": "1992",
    "population": "counties wholly inside one contested House district, in districts with at least two such counties",
    "source": "county-returns",
    "unit": "points of margin",
    "value": 27.0063,
    "weights": "none (full counts)"
  },
  "house_rms_2024": {
    "display": "5.5",
    "estimand": "vote-weighted root mean square of the House margin minus the presidential margin",
    "n": 2277,
    "note": "",
    "period": "2024",
    "population": "counties wholly inside one contested House district, in districts with at least two such counties",
    "source": "county-returns",
    "unit": "points of margin",
    "value": 5.51989,
    "weights": "none (full counts)"
  },
  "house_rms_in_1992": {
    "display": "9.1",
    "estimand": "vote-weighted root mean square of the gap after subtracting each district mean gap, corrected by n/(n-1)",
    "n": 2348,
    "note": "",
    "period": "1992",
    "population": "counties wholly inside one contested House district, in districts with at least two such counties",
    "source": "county-returns",
    "unit": "points of margin",
    "value": 9.1077,
    "weights": "none (full counts)"
  },
  "house_rms_in_2024": {
    "display": "2.3",
    "estimand": "vote-weighted root mean square of the gap after subtracting each district mean gap, corrected by n/(n-1)",
    "n": 2277,
    "note": "",
    "period": "2024",
    "population": "counties wholly inside one contested House district, in districts with at least two such counties",
    "source": "county-returns",
    "unit": "points of margin",
    "value": 2.26679,
    "weights": "none (full counts)"
  },
  "house_ru_1992": {
    "ci": [
      0.47,
      0.67
    ],
    "ciLevel": 0.95,
    "display": "+0.58",
    "estimand": "county-equal correlation between the county presidential margin and the House margin",
    "n": 2735,
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "correlation coefficient, from -1 to +1",
    "value": 0.577099,
    "weights": "none (each county counted once)"
  },
  "house_ru_2024": {
    "ci": [
      0.98,
      0.99
    ],
    "ciLevel": 0.95,
    "display": "+0.98",
    "estimand": "county-equal correlation between the county presidential margin and the House margin",
    "n": 2695,
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "correlation coefficient, from -1 to +1",
    "value": 0.984663,
    "weights": "none (each county counted once)"
  },
  "house_senate_r": {
    "display": "+0.94",
    "estimand": "correlation across the 19 studies between the yearly president and House share who split and the president and Senate share",
    "note": "",
    "period": "1952-2024",
    "population": "ANES studies with both series",
    "source": "anes",
    "unit": "correlation coefficient, from -1 to +1",
    "value": 0.943559,
    "weights": "none (summary of the yearly estimates)"
  },
  "house_sens_max": {
    "display": "2.1",
    "estimand": "largest yearly difference in the share of divided counties between the main sample and all returns, House",
    "note": "",
    "period": "1992-2024",
    "population": "counties with House returns",
    "source": "county-returns",
    "unit": "percentage points",
    "value": 2.13921,
    "weights": "none (full counts)"
  },
  "house_sens_year": {
    "display": "2004",
    "estimand": "election with the largest difference between the main sample and all returns, House",
    "note": "",
    "period": "1992-2024",
    "population": "counties with House returns",
    "source": "county-returns",
    "unit": "year",
    "value": 2004,
    "weights": "none (full counts)"
  },
  "house_south_1992": {
    "display": "32.5%",
    "estimand": "share of counties that are divided, South",
    "n": 1207,
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested House race in every district part, Census South region",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 32.4772,
    "weights": "none (full counts)"
  },
  "house_south_2004": {
    "display": "30.5%",
    "estimand": "share of counties that are divided, South",
    "n": 985,
    "note": "",
    "period": "2004",
    "population": "counties in the 48 contiguous states with a contested House race in every district part, Census South region",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 30.4569,
    "weights": "none (full counts)"
  },
  "house_south_2012": {
    "display": "7.6%",
    "estimand": "share of counties that are divided, South",
    "n": 1129,
    "note": "",
    "period": "2012",
    "population": "counties in the 48 contiguous states with a contested House race in every district part, Census South region",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 7.61736,
    "weights": "none (full counts)"
  },
  "house_south_2016": {
    "display": "5.1%",
    "estimand": "share of counties that are divided, South",
    "n": 1003,
    "note": "",
    "period": "2016",
    "population": "counties in the 48 contiguous states with a contested House race in every district part, Census South region",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 5.08475,
    "weights": "none (full counts)"
  },
  "house_south_2024": {
    "display": "2.9%",
    "estimand": "share of counties that are divided, South",
    "n": 1120,
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part, Census South region",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 2.94643,
    "weights": "none (full counts)"
  },
  "house_votes_1992": {
    "display": "27.9%",
    "estimand": "share of presidential two-party votes cast in counties whose presidential winner differs from the House winner",
    "n": 2735,
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of presidential two-party votes",
    "value": 27.9352,
    "weights": "none (full counts)"
  },
  "house_votes_2024": {
    "display": "5.5%",
    "estimand": "share of presidential two-party votes cast in counties whose presidential winner differs from the House winner",
    "n": 2695,
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "percent of presidential two-party votes",
    "value": 5.48238,
    "weights": "none (full counts)"
  },
  "major_min": {
    "display": "80%",
    "estimand": "least share of all votes that the two major-party candidates together must win for a race to count as a two-party race",
    "note": "",
    "period": "1992-2024",
    "population": "county races",
    "source": "county-returns",
    "unit": "percent of votes in the race",
    "value": 80,
    "weights": "none (full counts)"
  },
  "mid_hi": {
    "display": "18.3%",
    "estimand": "highest of the yearly shares who split, president and House",
    "note": "",
    "period": "1996-2008",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 18.3476,
    "weights": "none (summary of the yearly estimates)"
  },
  "mid_lo": {
    "display": "16.7%",
    "estimand": "lowest of the yearly shares who split, president and House",
    "note": "",
    "period": "1996-2008",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 16.7286,
    "weights": "none (summary of the yearly estimates)"
  },
  "mode_diff_2012": {
    "ci": [
      -4.9,
      1.1
    ],
    "ciLevel": 0.95,
    "display": "−1.9",
    "estimand": "web minus in-person difference in the weighted share who split, president and House",
    "n": 3501,
    "note": "",
    "period": "2012",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": -1.85864,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "mode_diff_2016": {
    "ci": [
      3.4,
      10.9
    ],
    "ciLevel": 0.95,
    "display": "+7.2",
    "estimand": "web minus in-person difference in the weighted share who split, president and House",
    "n": 2138,
    "note": "",
    "period": "2016",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 7.18756,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "mode_diff_2024": {
    "ci": [
      -3.2,
      2.7
    ],
    "ciLevel": 0.95,
    "display": "−0.3",
    "estimand": "web minus in-person difference in the weighted share who split, president and House",
    "n": 1806,
    "note": "",
    "period": "2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": -0.276099,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "n_2024_other": {
    "display": "1,709",
    "estimand": "count in neither mode group (panel and paper cases)",
    "note": "",
    "period": "2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "respondents",
    "value": 1709,
    "weights": "none (count)"
  },
  "n_check_both": {
    "display": "25,637",
    "estimand": "count of respondents whose rebuilt code is compared with VCF0709",
    "note": "",
    "period": "1952-2020",
    "population": "respondents with VCF0709 and both vote items",
    "source": "anes",
    "unit": "respondents",
    "value": 25637,
    "weights": "none (count)"
  },
  "n_check_only_vcf": {
    "display": "2",
    "estimand": "count with VCF0709 but a missing presidential or House vote item",
    "note": "",
    "period": "1984",
    "population": "1984 respondents with VCF0709",
    "source": "anes",
    "unit": "respondents",
    "value": 2,
    "weights": "none (count)"
  },
  "n_check_years": {
    "display": "18",
    "estimand": "count of studies in which the rebuilt code is compared with VCF0709",
    "note": "",
    "period": "1952-2020",
    "population": "ANES studies with VCF0709",
    "source": "anes",
    "unit": "studies",
    "value": 18,
    "weights": "none (count)"
  },
  "n_common": {
    "display": "19",
    "estimand": "count of studies in the correlation between the House and Senate series",
    "note": "",
    "period": "1952-2024",
    "population": "ANES studies with both series",
    "source": "anes",
    "unit": "studies",
    "value": 19,
    "weights": "none (count)"
  },
  "n_drh_larger": {
    "display": "7",
    "estimand": "count of studies in which the Democratic-president, Republican-House share exceeds the Republican-president, Democratic-House share (point estimates)",
    "note": "",
    "period": "1996-2024",
    "population": "ANES studies from 1996 to 2024",
    "source": "anes",
    "unit": "studies",
    "value": 7,
    "weights": "none (count)"
  },
  "n_elections": {
    "display": "9",
    "estimand": "count of presidential elections compared",
    "note": "",
    "period": "1992-2024",
    "population": "presidential elections in the county file",
    "source": "county-returns",
    "unit": "elections",
    "value": 9,
    "weights": "none (full counts)"
  },
  "n_house": {
    "display": "29,103",
    "estimand": "count of respondents with a post-election weight in the 19 studies",
    "note": "",
    "period": "1952-2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "respondents",
    "value": 29103,
    "weights": "none (count)"
  },
  "n_house_1992": {
    "display": "2,735",
    "estimand": "count of counties in the main House sample",
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "counties",
    "value": 2735,
    "weights": "none (full counts)"
  },
  "n_house_2024": {
    "display": "2,695",
    "estimand": "count of counties in the main House sample",
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "counties",
    "value": 2695,
    "weights": "none (full counts)"
  },
  "n_house_race_binds": {
    "display": "14",
    "estimand": "count of House races that fail only the 80% condition",
    "note": "",
    "period": "1992-2024",
    "population": "House races with candidates of both parties",
    "source": "county-returns",
    "unit": "races",
    "value": 14,
    "weights": "none (full counts)"
  },
  "n_house_race_rule": {
    "display": "3,097",
    "estimand": "count removed because the race was not a contested two-party race",
    "note": "",
    "period": "1992-2024",
    "population": "county-years that pass rules 1 and 2, House",
    "source": "county-returns",
    "unit": "county-years",
    "value": 3097,
    "weights": "none (full counts)"
  },
  "n_house_rd_larger": {
    "display": "7",
    "estimand": "count of elections in which counties with a Republican for president and a Democrat for the House outnumber the reverse",
    "note": "",
    "period": "1992-2024",
    "population": "counties in the 48 contiguous states with a contested House race in every district part",
    "source": "county-returns",
    "unit": "elections",
    "value": 7,
    "weights": "none (full counts)"
  },
  "n_house_returns": {
    "display": "27,567",
    "estimand": "count of county-years with presidential votes and House returns",
    "note": "",
    "period": "1992-2024",
    "population": "county-years with presidential votes and House returns",
    "source": "county-returns",
    "unit": "county-years",
    "value": 27567,
    "weights": "none (full counts)"
  },
  "n_house_screen": {
    "display": "687",
    "estimand": "count removed by the totals screen",
    "note": "",
    "period": "1992-2024",
    "population": "county-years with presidential votes and House returns",
    "source": "county-returns",
    "unit": "county-years",
    "value": 687,
    "weights": "none (full counts)"
  },
  "n_indep_senate": {
    "display": "123",
    "estimand": "count removed because an independent is coded as a major-party candidate (Maine and Vermont 2012, Nebraska 2024)",
    "note": "",
    "period": "2012 and 2024",
    "population": "county-years with presidential votes and Senate returns",
    "source": "county-returns",
    "unit": "county-years",
    "value": 123,
    "weights": "none (full counts)"
  },
  "n_kc_years": {
    "display": "6",
    "estimand": "count of elections in which Jackson County is left out because the file omits the Kansas City part",
    "note": "",
    "period": "2004-2024",
    "population": "Jackson County, Missouri",
    "source": "county-returns",
    "unit": "elections",
    "value": 6,
    "weights": "none (full counts)"
  },
  "n_no_post_weight": {
    "display": "64",
    "estimand": "count with both votes but no post-election weight in a study that has one",
    "note": "",
    "period": "2016, 2020 and 2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "respondents",
    "value": 64,
    "weights": "none (count)"
  },
  "n_post96": {
    "display": "8",
    "estimand": "count of ANES studies from 1996 to 2024",
    "note": "",
    "period": "1996-2024",
    "population": "ANES studies from 1996 to 2024",
    "source": "anes",
    "unit": "studies",
    "value": 8,
    "weights": "none (count)"
  },
  "n_pres_counties_2024": {
    "display": "3,107",
    "estimand": "count of counties with presidential two-party votes",
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with presidential votes",
    "source": "county-returns",
    "unit": "counties",
    "value": 3107,
    "weights": "none (full counts)"
  },
  "n_rebuilt_2024": {
    "display": "3,530",
    "estimand": "count of respondents whose president-House code exists only in the rebuilt version",
    "note": "",
    "period": "2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "respondents",
    "value": 3530,
    "weights": "none (count)"
  },
  "n_screen_ga_1992": {
    "display": "158",
    "estimand": "count removed by the totals screen",
    "note": "",
    "period": "1992",
    "population": "Georgia Senate 1992",
    "source": "county-returns",
    "unit": "county-years",
    "value": 158,
    "weights": "none (full counts)"
  },
  "n_screen_ga_2008": {
    "display": "157",
    "estimand": "count removed by the totals screen",
    "note": "",
    "period": "2008",
    "population": "Georgia Senate 2008",
    "source": "county-returns",
    "unit": "county-years",
    "value": 157,
    "weights": "none (full counts)"
  },
  "n_screen_ia_2012": {
    "display": "99",
    "estimand": "count removed by the totals screen",
    "note": "",
    "period": "2012",
    "population": "Iowa House 2012",
    "source": "county-returns",
    "unit": "county-years",
    "value": 99,
    "weights": "none (full counts)"
  },
  "n_screen_la_1992": {
    "display": "61",
    "estimand": "count removed by the totals screen",
    "note": "",
    "period": "1992",
    "population": "Louisiana Senate 1992",
    "source": "county-returns",
    "unit": "county-years",
    "value": 61,
    "weights": "none (full counts)"
  },
  "n_screen_other_house": {
    "display": "588",
    "estimand": "count removed by the totals screen outside the Iowa 2012 file",
    "note": "",
    "period": "1992-2024",
    "population": "county-years with presidential votes and House returns",
    "source": "county-returns",
    "unit": "county-years",
    "value": 588,
    "weights": "none (full counts)"
  },
  "n_screen_other_house_c": {
    "display": "150",
    "estimand": "count of those that would otherwise be in the main House sample",
    "note": "",
    "period": "1992-2024",
    "population": "county-years with presidential votes and House returns",
    "source": "county-returns",
    "unit": "county-years",
    "value": 150,
    "weights": "none (full counts)"
  },
  "n_screen_other_senate": {
    "display": "22",
    "estimand": "count removed by the totals screen outside the three named Senate state-years",
    "note": "",
    "period": "1992-2024",
    "population": "county-years with presidential votes and Senate returns",
    "source": "county-returns",
    "unit": "county-years",
    "value": 22,
    "weights": "none (full counts)"
  },
  "n_senate": {
    "display": "20,334",
    "estimand": "count of respondents with a post-election weight in the 19 studies",
    "note": "",
    "period": "1952-2024",
    "population": "respondents who reported a major-party presidential vote and a major-party Senate vote (states with a Senate race)",
    "source": "anes",
    "unit": "respondents",
    "value": 20334,
    "weights": "none (count)"
  },
  "n_senate_race_binds": {
    "display": "1",
    "estimand": "count of Senate races that fail only the 80% condition",
    "note": "",
    "period": "1992-2024",
    "population": "Senate races with candidates of both parties",
    "source": "county-returns",
    "unit": "races",
    "value": 1,
    "weights": "none (full counts)"
  },
  "n_senate_race_rule": {
    "display": "295",
    "estimand": "count removed because the race was not a contested two-party race",
    "note": "",
    "period": "1992-2024",
    "population": "county-years that pass rules 1 and 2, Senate",
    "source": "county-returns",
    "unit": "county-years",
    "value": 295,
    "weights": "none (full counts)"
  },
  "n_senate_rd_larger": {
    "display": "6",
    "estimand": "count of elections in which counties with a Republican for president and a Democrat for the Senate outnumber the reverse",
    "note": "",
    "period": "1992-2024",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "elections",
    "value": 6,
    "weights": "none (full counts)"
  },
  "n_senate_returns": {
    "display": "18,645",
    "estimand": "count of county-years with presidential votes and Senate returns",
    "note": "",
    "period": "1992-2024",
    "population": "county-years with presidential votes and Senate returns",
    "source": "county-returns",
    "unit": "county-years",
    "value": 18645,
    "weights": "none (full counts)"
  },
  "n_senate_screen": {
    "display": "398",
    "estimand": "count removed by the totals screen",
    "note": "",
    "period": "1992-2024",
    "population": "county-years with presidential votes and Senate returns",
    "source": "county-returns",
    "unit": "county-years",
    "value": 398,
    "weights": "none (full counts)"
  },
  "n_senate_states_2024": {
    "display": "29",
    "estimand": "count of states in the main Senate sample",
    "note": "",
    "period": "2024",
    "population": "states with a contested Senate race in 2024",
    "source": "county-returns",
    "unit": "states",
    "value": 29,
    "weights": "none (full counts)"
  },
  "n_studies": {
    "display": "19",
    "estimand": "count of studies with the president and House vote items",
    "note": "",
    "period": "1952-2024",
    "population": "ANES presidential-election studies",
    "source": "anes",
    "unit": "studies",
    "value": 19,
    "weights": "none (count)"
  },
  "net_1972": {
    "ci": [
      17.7,
      23.2
    ],
    "ciLevel": 0.95,
    "display": "+20.4",
    "estimand": "weighted mean of the House Democratic vote minus the presidential Democratic vote, in points (the net effect of splitting on the House vote)",
    "n": 1293,
    "note": "",
    "period": "1972",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 20.4176,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "net_1992": {
    "ci": [
      -0.6,
      4.9
    ],
    "ciLevel": 0.95,
    "display": "+2.1",
    "estimand": "weighted mean of the House Democratic vote minus the presidential Democratic vote, in points (the net effect of splitting on the House vote)",
    "n": 1126,
    "note": "",
    "period": "1992",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 2.12341,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "net_1996": {
    "ci": [
      -12,
      -6.1
    ],
    "ciLevel": 0.95,
    "display": "−9.1",
    "estimand": "weighted mean of the House Democratic vote minus the presidential Democratic vote, in points (the net effect of splitting on the House vote)",
    "n": 926,
    "note": "",
    "period": "1996",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": -9.07747,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "net_2024": {
    "ci": [
      -2.3,
      -0.2
    ],
    "ciLevel": 0.95,
    "display": "−1.3",
    "estimand": "weighted mean of the House Democratic vote minus the presidential Democratic vote, in points (the net effect of splitting on the House vote)",
    "n": 3515,
    "note": "",
    "period": "2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": -1.25765,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "plateau_hi": {
    "display": "29.5%",
    "estimand": "highest of the yearly shares who split, president and House",
    "note": "",
    "period": "1972-1988",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 29.5437,
    "weights": "none (summary of the yearly estimates)"
  },
  "plateau_lo": {
    "display": "24.8%",
    "estimand": "lowest of the yearly shares who split, president and House",
    "note": "",
    "period": "1972-1988",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 24.7656,
    "weights": "none (summary of the yearly estimates)"
  },
  "pre_hi": {
    "display": "17.8%",
    "estimand": "highest of the yearly shares who split, president and House",
    "note": "",
    "period": "1952-1968",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 17.7835,
    "weights": "none (summary of the yearly estimates)"
  },
  "pre_lo": {
    "display": "12.6%",
    "estimand": "lowest of the yearly shares who split, president and House",
    "note": "",
    "period": "1952-1968",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 12.5867,
    "weights": "none (summary of the yearly estimates)"
  },
  "ratio_hi": {
    "display": "1.3",
    "estimand": "upper bound of the totals screen: down-ballot total votes over presidential total votes",
    "note": "",
    "period": "1992-2024",
    "population": "county races",
    "source": "county-returns",
    "unit": "ratio of votes",
    "value": 1.3,
    "weights": "none (full counts)"
  },
  "ratio_lo": {
    "display": "0.7",
    "estimand": "lower bound of the totals screen: down-ballot total votes over presidential total votes",
    "note": "",
    "period": "1992-2024",
    "population": "county races",
    "source": "county-returns",
    "unit": "ratio of votes",
    "value": 0.7,
    "weights": "none (full counts)"
  },
  "rdh_1972": {
    "ci": [
      22.6,
      27.3
    ],
    "ciLevel": 0.95,
    "display": "25.0%",
    "estimand": "weighted share who voted Republican for president and Democratic for the House",
    "n": 1293,
    "note": "",
    "period": "1972",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 24.9807,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "rdh_1988": {
    "ci": [
      15.9,
      20.6
    ],
    "ciLevel": 0.95,
    "display": "18.3%",
    "estimand": "weighted share who voted Republican for president and Democratic for the House",
    "n": 1030,
    "note": "",
    "period": "1988",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 18.2524,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "rdh_1996": {
    "ci": [
      2.8,
      5.7
    ],
    "ciLevel": 0.95,
    "display": "4.3%",
    "estimand": "weighted share who voted Republican for president and Democratic for the House",
    "n": 926,
    "note": "",
    "period": "1996",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 4.29201,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "rdh_2020": {
    "ci": [
      3.8,
      5.4
    ],
    "ciLevel": 0.95,
    "display": "4.6%",
    "estimand": "weighted share who voted Republican for president and Democratic for the House",
    "n": 5167,
    "note": "",
    "period": "2020",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 4.56633,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "rdh_2024": {
    "ci": [
      1.1,
      2.3
    ],
    "ciLevel": 0.95,
    "display": "1.7%",
    "estimand": "weighted share who voted Republican for president and Democratic for the House",
    "n": 3515,
    "note": "",
    "period": "2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 1.71617,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "rise_h_2012_2016": {
    "ci": [
      3.2,
      7.7
    ],
    "ciLevel": 0.95,
    "display": "+5.5",
    "estimand": "change in the weighted share who split, 2016 minus 2012 (two separate samples)",
    "n": 5639,
    "note": "",
    "period": "2012 to 2016",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 5.46702,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "s_mode_diff_2012": {
    "ci": [
      -2.2,
      4.4
    ],
    "ciLevel": 0.95,
    "display": "+1.1",
    "estimand": "web minus in-person difference in the weighted share who split, president and Senate",
    "n": 2814,
    "note": "",
    "period": "2012",
    "population": "respondents who reported a major-party presidential vote and a major-party Senate vote (states with a Senate race)",
    "source": "anes",
    "unit": "percentage points",
    "value": 1.10419,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "s_mode_diff_2016": {
    "ci": [
      -0.6,
      8
    ],
    "ciLevel": 0.95,
    "display": "+3.7",
    "estimand": "web minus in-person difference in the weighted share who split, president and Senate",
    "n": 1625,
    "note": "",
    "period": "2016",
    "population": "respondents who reported a major-party presidential vote and a major-party Senate vote (states with a Senate race)",
    "source": "anes",
    "unit": "percentage points",
    "value": 3.72374,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "s_mode_diff_2024": {
    "ci": [
      -5.8,
      2.5
    ],
    "ciLevel": 0.95,
    "display": "−1.7",
    "estimand": "web minus in-person difference in the weighted share who split, president and Senate",
    "n": 1356,
    "note": "",
    "period": "2024",
    "population": "respondents who reported a major-party presidential vote and a major-party Senate vote (states with a Senate race)",
    "source": "anes",
    "unit": "percentage points",
    "value": -1.65849,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "s_web_rise_2012_2016": {
    "ci": [
      -0.5,
      5.5
    ],
    "ciLevel": 0.95,
    "display": "+2.5",
    "estimand": "difference in weighted shares who split, 2016 minus 2012 (separate samples)",
    "n": 3155,
    "note": "",
    "period": "2012 to 2016, web respondents, president and Senate",
    "population": "respondents who reported a major-party presidential vote and a major-party Senate vote (states with a Senate race)",
    "source": "anes",
    "unit": "percentage points",
    "value": 2.5406,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "screen_sens_house": {
    "display": "0.5",
    "estimand": "largest yearly change in the share of divided counties if the totals screen is dropped",
    "note": "",
    "period": "1992-2024",
    "population": "counties in the main House sample",
    "source": "county-returns",
    "unit": "percentage points",
    "value": 0.53518,
    "weights": "none (full counts)"
  },
  "screen_sens_senate": {
    "display": "1.3",
    "estimand": "largest yearly change in the share of divided counties if the totals screen is dropped",
    "note": "",
    "period": "1992-2024",
    "population": "counties in the main Senate sample",
    "source": "county-returns",
    "unit": "percentage points",
    "value": 1.28874,
    "weights": "none (full counts)"
  },
  "senate_between_2024": {
    "display": "83%",
    "estimand": "share of the vote-weighted mean square of the gap that is the state mean gap, corrected by n/(n-1)",
    "n": 1749,
    "note": "",
    "period": "2024",
    "population": "counties in a contested Senate race, in states with at least two such counties",
    "source": "county-returns",
    "unit": "percent of the mean square",
    "value": 82.9214,
    "weights": "none (full counts)"
  },
  "senate_between_hi": {
    "display": "91%",
    "estimand": "highest yearly corrected share of the mean square of the gap that is the state mean gap",
    "note": "",
    "period": "1992-2024",
    "population": "counties in a contested Senate race, in states with at least two such counties",
    "source": "county-returns",
    "unit": "percent of the mean square",
    "value": 90.8435,
    "weights": "none (full counts)"
  },
  "senate_between_lo": {
    "display": "64%",
    "estimand": "lowest yearly corrected share of the mean square of the gap that is the state mean gap",
    "note": "",
    "period": "1992-2024",
    "population": "counties in a contested Senate race, in states with at least two such counties",
    "source": "county-returns",
    "unit": "percent of the mean square",
    "value": 64.3604,
    "weights": "none (full counts)"
  },
  "senate_chg_2008_2012": {
    "ci": [
      -5.2,
      1.6
    ],
    "ciLevel": 0.95,
    "display": "−1.8",
    "estimand": "change in the weighted share who split, president and Senate, 2012 minus 2008 (two separate samples)",
    "n": 3600,
    "note": "",
    "period": "2008 to 2012",
    "population": "respondents who reported a major-party presidential vote and a major-party Senate vote (states with a Senate race)",
    "source": "anes",
    "unit": "percentage points",
    "value": -1.81651,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "senate_cov_hi": {
    "display": "74%",
    "estimand": "highest yearly share of the presidential two-party votes of the 48 contiguous states cast in the main Senate sample",
    "note": "",
    "period": "1992-2024",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percent of presidential two-party votes",
    "value": 73.663,
    "weights": "none (full counts)"
  },
  "senate_cov_lo": {
    "display": "49%",
    "estimand": "lowest yearly share of the presidential two-party votes of the 48 contiguous states cast in the main Senate sample",
    "note": "",
    "period": "1992-2024",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percent of presidential two-party votes",
    "value": 48.5567,
    "weights": "none (full counts)"
  },
  "senate_dem_rep_1996": {
    "display": "369",
    "estimand": "count of counties won by the Democrat for president and the Republican for the Senate",
    "note": "",
    "period": "1996",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "counties",
    "value": 369,
    "weights": "none (full counts)"
  },
  "senate_dem_rep_2020": {
    "display": "22",
    "estimand": "count of counties won by the Democrat for president and the Republican for the Senate",
    "note": "",
    "period": "2020",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "counties",
    "value": 22,
    "weights": "none (full counts)"
  },
  "senate_dem_rep_2024": {
    "display": "8",
    "estimand": "count of counties won by the Democrat for president and the Republican for the Senate",
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "counties",
    "value": 8,
    "weights": "none (full counts)"
  },
  "senate_div_1992": {
    "display": "30.9%",
    "estimand": "share of counties whose presidential winner differs from the Senate winner",
    "n": 1824,
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 30.9211,
    "weights": "none (full counts)"
  },
  "senate_div_1996": {
    "display": "20.2%",
    "estimand": "share of counties whose presidential winner differs from the Senate winner",
    "n": 2288,
    "note": "",
    "period": "1996",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 20.236,
    "weights": "none (full counts)"
  },
  "senate_div_2000": {
    "display": "21.1%",
    "estimand": "share of counties whose presidential winner differs from the Senate winner",
    "n": 1858,
    "note": "",
    "period": "2000",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 21.098,
    "weights": "none (full counts)"
  },
  "senate_div_2004": {
    "display": "29.6%",
    "estimand": "share of counties whose presidential winner differs from the Senate winner",
    "n": 2006,
    "note": "",
    "period": "2004",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 29.6112,
    "weights": "none (full counts)"
  },
  "senate_div_2008": {
    "display": "24.4%",
    "estimand": "share of counties whose presidential winner differs from the Senate winner",
    "n": 2055,
    "note": "",
    "period": "2008",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 24.3796,
    "weights": "none (full counts)"
  },
  "senate_div_2012": {
    "display": "18.2%",
    "estimand": "share of counties whose presidential winner differs from the Senate winner",
    "n": 1843,
    "note": "",
    "period": "2012",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 18.1769,
    "weights": "none (full counts)"
  },
  "senate_div_2016": {
    "display": "6.2%",
    "estimand": "share of counties whose presidential winner differs from the Senate winner",
    "n": 1989,
    "note": "",
    "period": "2016",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 6.23429,
    "weights": "none (full counts)"
  },
  "senate_div_2020": {
    "display": "1.9%",
    "estimand": "share of counties whose presidential winner differs from the Senate winner",
    "n": 2212,
    "note": "",
    "period": "2020",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 1.94394,
    "weights": "none (full counts)"
  },
  "senate_div_2024": {
    "display": "3.0%",
    "estimand": "share of counties whose presidential winner differs from the Senate winner",
    "n": 1749,
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percent of counties",
    "value": 3.0303,
    "weights": "none (full counts)"
  },
  "senate_fall_0812": {
    "display": "6.2",
    "estimand": "2008 share of divided counties minus 2012 share, Senate",
    "note": "",
    "period": "2008 to 2012",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percentage points",
    "value": 6.20268,
    "weights": "none (full counts)"
  },
  "senate_fall_1216": {
    "display": "11.9",
    "estimand": "2012 share of divided counties minus 2016 share, Senate",
    "note": "",
    "period": "2012 to 2016",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "percentage points",
    "value": 11.9426,
    "weights": "none (full counts)"
  },
  "senate_mad_1992": {
    "ci": [
      12.1,
      21.1
    ],
    "ciLevel": 0.95,
    "display": "15.9",
    "estimand": "vote-weighted mean absolute difference between the Senate margin and the presidential margin",
    "n": 1824,
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "points of margin",
    "value": 15.9327,
    "weights": "presidential two-party votes in the county"
  },
  "senate_mad_2024": {
    "ci": [
      3.4,
      6
    ],
    "ciLevel": 0.95,
    "display": "4.6",
    "estimand": "vote-weighted mean absolute difference between the Senate margin and the presidential margin",
    "n": 1749,
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "points of margin",
    "value": 4.57016,
    "weights": "presidential two-party votes in the county"
  },
  "senate_r_1992": {
    "ci": [
      0.47,
      0.79
    ],
    "ciLevel": 0.95,
    "display": "+0.63",
    "estimand": "vote-weighted correlation between the county presidential margin and the Senate margin",
    "n": 1824,
    "note": "",
    "period": "1992",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "correlation coefficient, from -1 to +1",
    "value": 0.631349,
    "weights": "presidential two-party votes in the county"
  },
  "senate_r_2024": {
    "ci": [
      0.97,
      0.99
    ],
    "ciLevel": 0.95,
    "display": "+0.98",
    "estimand": "vote-weighted correlation between the county presidential margin and the Senate margin",
    "n": 1749,
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "correlation coefficient, from -1 to +1",
    "value": 0.982126,
    "weights": "presidential two-party votes in the county"
  },
  "senate_rep_dem_1996": {
    "display": "94",
    "estimand": "count of counties won by the Republican for president and the Democrat for the Senate",
    "note": "",
    "period": "1996",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "counties",
    "value": 94,
    "weights": "none (full counts)"
  },
  "senate_rep_dem_2020": {
    "display": "21",
    "estimand": "count of counties won by the Republican for president and the Democrat for the Senate",
    "note": "",
    "period": "2020",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "counties",
    "value": 21,
    "weights": "none (full counts)"
  },
  "senate_rep_dem_2024": {
    "display": "45",
    "estimand": "count of counties won by the Republican for president and the Democrat for the Senate",
    "note": "",
    "period": "2024",
    "population": "counties in the 48 contiguous states with a contested Senate race",
    "source": "county-returns",
    "unit": "counties",
    "value": 45,
    "weights": "none (full counts)"
  },
  "senate_rms_2024": {
    "display": "6.1",
    "estimand": "vote-weighted root mean square of the Senate margin minus the presidential margin",
    "n": 1749,
    "note": "",
    "period": "2024",
    "population": "counties in a contested Senate race, in states with at least two such counties",
    "source": "county-returns",
    "unit": "points of margin",
    "value": 6.09471,
    "weights": "none (full counts)"
  },
  "senate_rms_in_2024": {
    "display": "2.5",
    "estimand": "vote-weighted root mean square of the gap after subtracting each state mean gap, corrected by n/(n-1)",
    "n": 1749,
    "note": "",
    "period": "2024",
    "population": "counties in a contested Senate race, in states with at least two such counties",
    "source": "county-returns",
    "unit": "points of margin",
    "value": 2.51871,
    "weights": "none (full counts)"
  },
  "senate_sens_max": {
    "display": "1.0",
    "estimand": "largest yearly difference in the share of divided counties between the main sample and all returns, Senate",
    "note": "",
    "period": "1992-2024",
    "population": "counties with Senate returns",
    "source": "county-returns",
    "unit": "percentage points",
    "value": 0.953975,
    "weights": "none (full counts)"
  },
  "share_house_screen": {
    "display": "2.5%",
    "estimand": "share removed by the totals screen",
    "note": "",
    "period": "1992-2024",
    "population": "county-years with presidential votes and House returns",
    "source": "county-returns",
    "unit": "percent of county-years",
    "value": 2.49211,
    "weights": "none (full counts)"
  },
  "share_senate_screen": {
    "display": "2.1%",
    "estimand": "share removed by the totals screen",
    "note": "",
    "period": "1992-2024",
    "population": "county-years with presidential votes and Senate returns",
    "source": "county-returns",
    "unit": "percent of county-years",
    "value": 2.13462,
    "weights": "none (full counts)"
  },
  "split_h_1952": {
    "ci": [
      10.5,
      14.6
    ],
    "ciLevel": 0.95,
    "display": "12.6%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 1009,
    "note": "",
    "period": "1952",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 12.5867,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_h_1972": {
    "ci": [
      27.1,
      32
    ],
    "ciLevel": 0.95,
    "display": "29.5%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 1293,
    "note": "",
    "period": "1972",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 29.5437,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_h_1992": {
    "ci": [
      19.9,
      24.8
    ],
    "ciLevel": 0.95,
    "display": "22.3%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 1126,
    "note": "",
    "period": "1992",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 22.3401,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_h_2008": {
    "ci": [
      14.1,
      19.3
    ],
    "ciLevel": 0.95,
    "display": "16.7%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 1222,
    "note": "",
    "period": "2008",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 16.7286,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_h_2008_ftf": {
    "ci": [
      14.2,
      19.4
    ],
    "ciLevel": 0.95,
    "display": "16.8%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 1222,
    "note": "",
    "period": "2008, in-person respondents",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 16.7612,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "split_h_2012": {
    "ci": [
      8.5,
      11.1
    ],
    "ciLevel": 0.95,
    "display": "9.8%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 3501,
    "note": "",
    "period": "2012",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 9.81353,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_h_2012_ftf": {
    "ci": [
      8.5,
      13.6
    ],
    "ciLevel": 0.95,
    "display": "11.0%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 1065,
    "note": "",
    "period": "2012, in-person respondents",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 11.0363,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "split_h_2012_web": {
    "ci": [
      7.7,
      10.7
    ],
    "ciLevel": 0.95,
    "display": "9.2%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 2436,
    "note": "",
    "period": "2012, web respondents",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 9.1777,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "split_h_2016": {
    "ci": [
      13.4,
      17.1
    ],
    "ciLevel": 0.95,
    "display": "15.3%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 2138,
    "note": "",
    "period": "2016",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 15.2805,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_h_2016_ftf": {
    "ci": [
      7.2,
      13.1
    ],
    "ciLevel": 0.95,
    "display": "10.2%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 619,
    "note": "",
    "period": "2016, in-person respondents",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 10.1665,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "split_h_2016_web": {
    "ci": [
      15.1,
      19.6
    ],
    "ciLevel": 0.95,
    "display": "17.4%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 1519,
    "note": "",
    "period": "2016, web respondents",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 17.354,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "split_h_2020": {
    "ci": [
      10.1,
      12.6
    ],
    "ciLevel": 0.95,
    "display": "11.4%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 5167,
    "note": "",
    "period": "2020",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 11.3524,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_h_2024": {
    "ci": [
      3.7,
      5.7
    ],
    "ciLevel": 0.95,
    "display": "4.7%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 3515,
    "note": "",
    "period": "2024",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 4.68999,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_h_2024_ftf": {
    "ci": [
      2.8,
      7.8
    ],
    "ciLevel": 0.95,
    "display": "5.3%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 579,
    "note": "",
    "period": "2024, in-person respondents",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 5.27301,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "split_h_2024_other": {
    "ci": [
      2.4,
      4.9
    ],
    "ciLevel": 0.95,
    "display": "3.7%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 1709,
    "note": "",
    "period": "2024",
    "population": "2024 panel and paper respondents with a major-party presidential and House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 3.65125,
    "weights": "weight_postelection (VCF9999)"
  },
  "split_h_2024_web": {
    "ci": [
      3.4,
      6.6
    ],
    "ciLevel": 0.95,
    "display": "5.0%",
    "estimand": "weighted share whose reported votes were for different parties, president and House",
    "n": 1227,
    "note": "",
    "period": "2024, web respondents",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percent of voters",
    "value": 4.99691,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "split_s_1972": {
    "ci": [
      25.3,
      31.7
    ],
    "ciLevel": 0.95,
    "display": "28.5%",
    "estimand": "weighted share whose reported votes were for different parties, president and Senate",
    "n": 765,
    "note": "",
    "period": "1972",
    "population": "respondents who reported a major-party presidential vote and a major-party Senate vote (states with a Senate race)",
    "source": "anes",
    "unit": "percent of voters",
    "value": 28.4967,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_s_2008": {
    "ci": [
      9.9,
      15.9
    ],
    "ciLevel": 0.95,
    "display": "12.9%",
    "estimand": "weighted share whose reported votes were for different parties, president and Senate",
    "n": 786,
    "note": "",
    "period": "2008",
    "population": "respondents who reported a major-party presidential vote and a major-party Senate vote (states with a Senate race)",
    "source": "anes",
    "unit": "percent of voters",
    "value": 12.8845,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_s_2012": {
    "ci": [
      9.5,
      12.6
    ],
    "ciLevel": 0.95,
    "display": "11.1%",
    "estimand": "weighted share whose reported votes were for different parties, president and Senate",
    "n": 2814,
    "note": "",
    "period": "2012",
    "population": "respondents who reported a major-party presidential vote and a major-party Senate vote (states with a Senate race)",
    "source": "anes",
    "unit": "percent of voters",
    "value": 11.068,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_s_2020": {
    "ci": [
      5.9,
      8.5
    ],
    "ciLevel": 0.95,
    "display": "7.2%",
    "estimand": "weighted share whose reported votes were for different parties, president and Senate",
    "n": 2879,
    "note": "",
    "period": "2020",
    "population": "respondents who reported a major-party presidential vote and a major-party Senate vote (states with a Senate race)",
    "source": "anes",
    "unit": "percent of voters",
    "value": 7.23057,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "split_s_2024": {
    "ci": [
      5.4,
      8.3
    ],
    "ciLevel": 0.95,
    "display": "6.8%",
    "estimand": "weighted share whose reported votes were for different parties, president and Senate",
    "n": 2525,
    "note": "",
    "period": "2024",
    "population": "respondents who reported a major-party presidential vote and a major-party Senate vote (states with a Senate race)",
    "source": "anes",
    "unit": "percent of voters",
    "value": 6.83616,
    "weights": "weight_postelection (VCF9999) in 1996, 2000, 2004, 2008, 2016, 2020 and 2024 and VCF0009z in the other studies including 2012; VCF0009z equals 1 for every respondent in 1952, 1956, 1964, 1968, 1972, 1980, 1984 and 1988, so those studies are unweighted"
  },
  "web_drop_2016_2024": {
    "ci": [
      9.6,
      15.2
    ],
    "ciLevel": 0.95,
    "display": "12.4",
    "estimand": "decrease in the weighted share who split, 2016 minus 2024 (two separate samples)",
    "n": 2746,
    "note": "",
    "period": "2016 to 2024, web respondents",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 12.3571,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  },
  "web_rise_2012_2016": {
    "ci": [
      5.4,
      10.9
    ],
    "ciLevel": 0.95,
    "display": "+8.2",
    "estimand": "difference in weighted shares who split, 2016 minus 2012 (separate samples)",
    "n": 3955,
    "note": "",
    "period": "2012 to 2016, web respondents, president and House",
    "population": "respondents who reported a major-party presidential vote and a major-party House vote",
    "source": "anes",
    "unit": "percentage points",
    "value": 8.17633,
    "weights": "weight_ftf (VCF0009x) for in-person respondents and weight_web (VCF0009y) for web respondents"
  }
}