{
 "meta": {
  "state": "California (CDE)",
  "source": "CDE downloadable Chronic Absenteeism files (school/district/county/state)",
  "metric": "CDE-published chronic absenteeism rate = chronically absent / eligible cumulative enrollment (absent >=10% of days enrolled) — an OFFICIAL rate, not derived, unlike the Philadelphia attendance-threshold proxy",
  "grade_resolution": "grade SPANS (K/TK-K, 1-3, 4-6, 7-8, 9-12), coarser than the single grades available for NYC/Philadelphia",
  "years": [
   "2016-17",
   "2017-18",
   "2018-19",
   "2020-21",
   "2021-22",
   "2022-23",
   "2023-24",
   "2024-25"
  ],
  "prepandemic": "2018-19",
  "peak": "2021-22",
  "latest": "2024-25",
  "note": "statewide ~10,000 schools; genuine pre-pandemic baseline enables the distribution-shift view"
 },
 "per_span": {
  "2016-17": {
   "K": 14.1,
   "1-3": 8.1,
   "4-6": 7.0,
   "7-8": 9.1,
   "9-12": 15.6,
   "overall": 10.9
  },
  "2017-18": {
   "K": 14.2,
   "1-3": 8.4,
   "4-6": 7.5,
   "7-8": 9.5,
   "9-12": 15.8,
   "overall": 11.2
  },
  "2018-19": {
   "K": 15.7,
   "1-3": 9.5,
   "4-6": 8.4,
   "7-8": 10.4,
   "9-12": 16.6,
   "overall": 12.2
  },
  "2020-21": {
   "K": 15.6,
   "1-3": 13.2,
   "4-6": 11.8,
   "7-8": 11.7,
   "9-12": 17.7,
   "overall": 14.3
  },
  "2021-22": {
   "K": 40.4,
   "1-3": 31.1,
   "4-6": 27.3,
   "7-8": 26.9,
   "9-12": 30.6,
   "overall": 30.2
  },
  "2022-23": {
   "K": 36.4,
   "1-3": 24.5,
   "4-6": 20.5,
   "7-8": 23.0,
   "9-12": 26.7,
   "overall": 25.1
  },
  "2023-24": {
   "K": 26.2,
   "1-3": 17.6,
   "4-6": 16.1,
   "7-8": 19.4,
   "9-12": 24.6,
   "overall": 20.6
  },
  "2024-25": {
   "K": 23.2,
   "1-3": 15.9,
   "4-6": 15.1,
   "7-8": 18.3,
   "9-12": 24.5,
   "overall": 19.6
  }
 },
 "grade_groups": {
  "2016-17": {
   "K": 14.1,
   "g1_8": 8.0,
   "g9_12": 15.6
  },
  "2017-18": {
   "K": 14.2,
   "g1_8": 8.3,
   "g9_12": 15.8
  },
  "2018-19": {
   "K": 15.7,
   "g1_8": 9.3,
   "g9_12": 16.6
  },
  "2020-21": {
   "K": 15.6,
   "g1_8": 12.3,
   "g9_12": 17.7
  },
  "2021-22": {
   "K": 40.4,
   "g1_8": 28.6,
   "g9_12": 30.6
  },
  "2022-23": {
   "K": 36.4,
   "g1_8": 22.6,
   "g9_12": 26.7
  },
  "2023-24": {
   "K": 26.2,
   "g1_8": 17.5,
   "g9_12": 24.6
  },
  "2024-25": {
   "K": 23.2,
   "g1_8": 16.2,
   "g9_12": 24.5
  }
 },
 "tail_by_level": {
  "2024-25": {
   "Combined (K-12)": {
    "n": 649,
    "n_gt50": 124,
    "pct_gt50": 19.1,
    "median": 21.8
   },
   "Elementary-Middle": {
    "n": 2005,
    "n_gt50": 19,
    "pct_gt50": 0.9,
    "median": 16.8
   },
   "Elementary": {
    "n": 4871,
    "n_gt50": 28,
    "pct_gt50": 0.6,
    "median": 17.4
   },
   "High": {
    "n": 1969,
    "n_gt50": 550,
    "pct_gt50": 27.9,
    "median": 27.3
   },
   "Middle": {
    "n": 375,
    "n_gt50": 11,
    "pct_gt50": 2.9,
    "median": 18.9
   },
   "Other/Ungraded": {
    "n": 67,
    "n_gt50": 23,
    "pct_gt50": 34.3,
    "median": 36.4
   }
  },
  "2018-19": {
   "High": {
    "n": 1970,
    "n_gt50": 504,
    "pct_gt50": 25.6,
    "median": 18.3
   },
   "Elementary-Middle": {
    "n": 1991,
    "n_gt50": 16,
    "pct_gt50": 0.8,
    "median": 9.5
   },
   "Combined (K-12)": {
    "n": 666,
    "n_gt50": 126,
    "pct_gt50": 18.9,
    "median": 17.6
   },
   "Elementary": {
    "n": 4923,
    "n_gt50": 16,
    "pct_gt50": 0.3,
    "median": 9.7
   },
   "Middle": {
    "n": 390,
    "n_gt50": 18,
    "pct_gt50": 4.6,
    "median": 10.4
   },
   "Other/Ungraded": {
    "n": 64,
    "n_gt50": 16,
    "pct_gt50": 25.0,
    "median": 27.3
   }
  }
 },
 "distribution_shift": {
  "2018-19": {
   "n": 10004,
   "median": 11.0,
   "mean": 16.4,
   "pct_gt50": 7.0,
   "bins_share": [
    44.7,
    34.0,
    9.5,
    2.9,
    1.9,
    2.1,
    1.8,
    1.5,
    1.0,
    0.6,
    0.1
   ]
  },
  "2024-25": {
   "n": 9936,
   "median": 18.9,
   "mean": 23.0,
   "pct_gt50": 7.6,
   "bins_share": [
    20.0,
    33.1,
    24.9,
    10.7,
    3.5,
    1.8,
    1.7,
    1.8,
    1.4,
    1.0,
    0.2
   ]
  }
 },
 "k_effect": {
  "n_schools": 5798,
  "median_step": 1.3,
  "n_over_1pp": 3323,
  "max_step": 17.6,
  "top_movers": [
   {
    "cds": "19647330117028",
    "name": "Dr. James Edward Jones Primary Center",
    "r_k8": 37.6,
    "r_18": 20.0,
    "step": 17.6,
    "k_share": 63.3,
    "n": 109
   },
   {
    "cds": "19647330109264",
    "name": "Lexington Avenue Primary Center",
    "r_k8": 37.2,
    "r_18": 23.5,
    "step": 13.7,
    "k_share": 60.5,
    "n": 129
   },
   {
    "cds": "19647330101618",
    "name": "Richard Riordan Primary Center",
    "r_k8": 18.8,
    "r_18": 7.5,
    "step": 11.3,
    "k_share": 44.4,
    "n": 144
   },
   {
    "cds": "01612596001689",
    "name": "Burckhalter Elementary",
    "r_k8": 47.0,
    "r_18": 38.3,
    "step": 8.7,
    "k_share": 30.7,
    "n": 215
   },
   {
    "cds": "16638916010334",
    "name": "Bret Harte Elementary",
    "r_k8": 28.4,
    "r_18": 20.0,
    "step": 8.4,
    "k_share": 59.9,
    "n": 574
   },
   {
    "cds": "01612596001929",
    "name": "Horace Mann Elementary",
    "r_k8": 33.2,
    "r_18": 25.0,
    "step": 8.2,
    "k_share": 29.0,
    "n": 214
   },
   {
    "cds": "18641966010821",
    "name": "McKinley Elementary",
    "r_k8": 28.8,
    "r_18": 20.8,
    "step": 8.0,
    "k_share": 42.7,
    "n": 403
   },
   {
    "cds": "38684786040950",
    "name": "El Dorado Elementary",
    "r_k8": 45.9,
    "r_18": 37.9,
    "step": 8.0,
    "k_share": 34.6,
    "n": 133
   },
   {
    "cds": "19646006014047",
    "name": "Hermosa View Elementary",
    "r_k8": 12.1,
    "r_18": 4.3,
    "step": 7.8,
    "k_share": 65.3,
    "n": 398
   },
   {
    "cds": "49708960120980",
    "name": "Rincon Valley Partnership",
    "r_k8": 31.3,
    "r_18": 23.6,
    "step": 7.7,
    "k_share": 32.1,
    "n": 131
   }
  ]
 },
 "comparison": {
  "NYC_2024_25": {
   "K": 37.8,
   "1-3": 30.6,
   "4-6": 27.1,
   "7-8": 30.0,
   "9-12": 34.7,
   "source": "dd1_grade_distortion.json (weighted per-grade -> spans)"
  },
  "Philadelphia_2024_25": {
   "K": 36.5,
   "1-3": 33.4,
   "4-6": 31.9,
   "7-8": 34.6,
   "9-12": 46.2,
   "source": "philly_replication.json (per-grade -> spans)"
  }
 }
}