{
  "alt": "Map of Cook County census tracts shaded by firearm homicide rate. Tracts at the high end of the key lie south of the Chicago Loop by tract centroid, the tracts well north of it sit at the low end of the key, and a scattering of gray tracts have no estimate.",
  "caption": "Clusters at the high end of the key lie south of the Loop, where {fact:chi_top_south} of the residents in the highest-rate tenth live by tract centroid, and the tracts well north of the Loop sit at the low end of the key; gray tracts have no stable estimate. Each tract takes the rate of its cluster, so neighbors in one cluster share a shade; the tooltip gives the cluster size, life expectancy and deprivation rank.",
  "data": [],
  "id": "chicago_homicide_map",
  "notes": [
    "The unit of this map is the tract cluster. CDC publishes one rate for each group of neighboring tracts (the median tract sits in a cluster of {fact:clu_tract_median}) and the file repeats it on every member tract, so a shade covers a cluster and the map does not describe single tracts. {fact:chi_n_tracts} tracts are shaded and {fact:chi_n_gray} are gray.",
    "A cluster-year with 1 to 9 deaths gets a CDC modeled estimate, one with no deaths a rate of zero from a count of zero, and one with 10 or more deaths a direct rate. A mean rate is shown only when CDC publishes a rate in each of 2022, 2023 and 2024, and the data for 2024 are provisional. The highest cluster rate is an average over several tracts, so a single block can run higher.",
    "Life expectancy is the USALEEP estimate for deaths in 2010 to 2015, area-weighted onto 2020 tracts, with institutional tracts left blank; the deprivation rank is the 2023 national percentile, 1 least and 100 most deprived."
  ],
  "source": "CDC Mapping Injury, Overdose, and Violence, tract file, firearm homicide, 2022-2024; modeled estimates for tract clusters; USALEEP 2010-2015; ADI 2023",
  "spec": {
    "geoid": "geoid",
    "legendLabel": "Firearm homicide deaths per 100,000 residents per year, 2022 to 2024",
    "payload": "chicago_homicide_map.json",
    "region": "cook",
    "scale": {
      "palette": "seq",
      "thresholds": [
        1,
        5,
        10,
        20,
        40,
        60
      ],
      "type": "threshold"
    },
    "tooltipKeys": [
      "cluster_tracts",
      "le",
      "adi"
    ],
    "tooltipLabels": {
      "adi": "Deprivation rank (1 least, 100 most deprived)",
      "cluster_tracts": "Tracts in the cluster",
      "le": "Life expectancy, deaths in 2010 to 2015 (years)"
    },
    "value": "rate",
    "valueFormat": {
      "digits": 1
    }
  },
  "subtitle": "Mean firearm homicide rate per 100,000 residents, 2022 to 2024, of the tract cluster each Cook County tract belongs to",
  "title": "In Cook County, {fact:chi_zero_pct} of tracts with an estimate sit in clusters with no recorded firearm homicide, while the highest cluster rate reaches {fact:chi_max_fa} per hundred thousand residents",
  "type": "tract-map",
  "width": "full"
}