{
  "authority": "One exact authority code \u00d7 year; inherited frozen geography, 2011 Census exact-code intersection. No name matching or boundary interpolation.",
  "lsoa": "One England LSOA21 code. Official corrected LAD2024 assignment, not an authority-model join.",
  "score": "Source score/rate; not a decile average. No aggregation of decile numbers is permitted.",
  "education": "No qualifications / total usual residents aged 16+. Numerators and denominators retained for aggregation before division.",
  "deciles": "1 most deprived / highest no-qualifications share; 10 least. Income and employment official national domain deciles for LSOAs, custom equal-area score quantiles for authorities.",
  "null": "Unavailable, never zero. Zero collision counts with positive mileage are retained.",
  "modelBands": "training-thresholds.json; each fold and vintage separately. display-thresholds.json and LSOA national bands are descriptive references and never reranked by UI filters.",
  "rate": "100000 \u00d7 summed police-reported injury collision counts / summed matched motor vehicle miles; no individual or causal interpretation"
}