{
  "release": "r23",
  "states": [
    "AK",
    "CT",
    "DC",
    "DE",
    "MA",
    "MT",
    "NE",
    "NM",
    "RI",
    "WI",
    "WY"
  ],
  "reference_records": 218740,
  "sampled_addresses": 22000,
  "tolerance_m": 50.0,
  "method": "adversarial_geocode_validation; 10k stratified bootstrap; same harness as the Utah validation; NAD-built reference",
  "headline": {
    "sensitivity": 98.66,
    "specificity_genuine": 95.17,
    "specificity_raw": 84.63,
    "precision": 93.69,
    "accuracy": 94.45,
    "positional_error_median_m": 0.0,
    "positional_error_p95_m": 0.0
  },
  "per_state": [
    {
      "state": "AK",
      "sensitivity": 99.72,
      "specificity_raw": 90.26,
      "precision": 95.93,
      "accuracy": 96.88
    },
    {
      "state": "CT",
      "sensitivity": 99.3,
      "specificity_raw": 86.79,
      "precision": 94.59,
      "accuracy": 95.57
    },
    {
      "state": "DC",
      "sensitivity": 96.23,
      "specificity_raw": 68.88,
      "precision": 87.94,
      "accuracy": 88.08
    },
    {
      "state": "DE",
      "sensitivity": 99.36,
      "specificity_raw": 91.17,
      "precision": 96.29,
      "accuracy": 96.93
    },
    {
      "state": "MA",
      "sensitivity": 99.11,
      "specificity_raw": 78.27,
      "precision": 91.37,
      "accuracy": 92.89
    },
    {
      "state": "MT",
      "sensitivity": 99.04,
      "specificity_raw": 88.51,
      "precision": 95.25,
      "accuracy": 95.88
    },
    {
      "state": "NE",
      "sensitivity": 99.1,
      "specificity_raw": 79.53,
      "precision": 91.61,
      "accuracy": 93.19
    },
    {
      "state": "NM",
      "sensitivity": 98.66,
      "specificity_raw": 81.02,
      "precision": 92.3,
      "accuracy": 93.36
    },
    {
      "state": "RI",
      "sensitivity": 99.51,
      "specificity_raw": 88.26,
      "precision": 95.24,
      "accuracy": 96.17
    },
    {
      "state": "WI",
      "sensitivity": 99.01,
      "specificity_raw": 88.16,
      "precision": 95.03,
      "accuracy": 95.72
    },
    {
      "state": "WY",
      "sensitivity": 96.17,
      "specificity_raw": 90.09,
      "precision": 95.69,
      "accuracy": 94.34
    }
  ],
  "positive_scenarios": [
    {
      "scenario": "clean",
      "n": 22000,
      "sensitivity": 99.74
    },
    {
      "scenario": "keyboard_typo",
      "n": 21953,
      "sensitivity": 99.65
    },
    {
      "scenario": "phonetic_typo",
      "n": 21920,
      "sensitivity": 96.86
    },
    {
      "scenario": "drop_name_token",
      "n": 21321,
      "sensitivity": 95.08
    },
    {
      "scenario": "case_punct_noise",
      "n": 22000,
      "sensitivity": 99.74
    },
    {
      "scenario": "missing_city",
      "n": 22000,
      "sensitivity": 99.68
    },
    {
      "scenario": "unit_appended",
      "n": 22000,
      "sensitivity": 99.74
    }
  ],
  "negative_scenarios": [
    {
      "scenario": "cross_county_zip",
      "n": 21998,
      "raw_fp": 523,
      "genuine_fp": 518,
      "specificity_raw": 97.62,
      "specificity_genuine": 97.65
    },
    {
      "scenario": "directional_swap",
      "n": 146,
      "raw_fp": 9,
      "genuine_fp": 8,
      "specificity_raw": 93.84,
      "specificity_genuine": 94.52
    },
    {
      "scenario": "house_from_distant_address",
      "n": 21419,
      "raw_fp": 1074,
      "genuine_fp": 1073,
      "specificity_raw": 94.99,
      "specificity_genuine": 94.99
    },
    {
      "scenario": "phonetic_fake_street",
      "n": 21965,
      "raw_fp": 8469,
      "genuine_fp": 1566,
      "specificity_raw": 61.44,
      "specificity_genuine": 92.87
    },
    {
      "scenario": "transposed_grid",
      "n": 18,
      "raw_fp": 0,
      "genuine_fp": 0,
      "specificity_raw": 100.0,
      "specificity_genuine": 100.0
    }
  ],
  "note": "specificity_raw is depressed by a generator artifact on named/ordinal streets; specificity_genuine is the trustworthy figure. Ground truth is the reference data's own coordinates, so this measures matcher-vs-data consistency, not absolute geographic truth."
}