{
  "alt": "A waterfall chart. The start bar is the 1980 share near the center, {fact:share_1980}. Donors who left change the share by a small amount, {fact:dec_exit} points on average, and the sign depends on the order of accounting. A large step down for donors who joined, {fact:dec_entry} points, ends at the 2024 share of {fact:share_2024}.",
  "caption": "The start bar is the 1980 share and the end bar is the 2024 share. Donors who joined between consecutive cycles change the share by {fact:dec_entry} points, and donors who left change it by {fact:dec_exit} points. The split averages two orders of accounting: with leavers removed first, joiners account for {fact:dec_entry_a} points, and with joiners added first {fact:dec_entry_b} points.",
  "data": [
    {
      "kind": "start",
      "step": "Pool in 1980",
      "value": 11.8119
    },
    {
      "kind": "delta",
      "step": "Donors who left",
      "value": 0.554006
    },
    {
      "kind": "delta",
      "step": "Donors who joined",
      "value": -11.2037
    },
    {
      "kind": "end",
      "step": "Pool in 2024",
      "value": 1.16223
    }
  ],
  "id": "entry_exit",
  "notes": [
    "Joined means active in a cycle and not in the cycle before, so it includes donors who return after a gap; left is the reverse. Donors active in both cycles keep their score, so they change the share only through their weight in the pool.",
    "The steps are summed over the cycle-to-cycle changes from 1980 to 2024. Full counts: no sampling interval."
  ],
  "source": "Stanford DIME v4.0 (Bonica), election cycles 1980-2024; full counts of itemized individual donors, no weights",
  "spec": {
    "format": {
      "digits": 1
    },
    "kind": "kind",
    "step": "step",
    "value": "value",
    "valueLabel": "Share within 0.25 of zero (%)"
  },
  "subtitle": "Change in the percent of active reliable donors within 0.25 of zero, 1980 to 2024, split into donors who left and donors who joined between consecutive cycles",
  "title": "Donors who joined the pool account for most of the fall in the near-center share",
  "type": "waterfall",
  "width": "body"
}