[
  {
    "field": "id",
    "unit": "text",
    "definition": "Unique authority code:year key",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "areaId",
    "unit": "ONS authority code",
    "definition": "Exact code; no approximate boundary backcast",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "name",
    "unit": "text",
    "definition": "Authority name for display",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "region",
    "unit": "text",
    "definition": "English region; London is target geography",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "year",
    "unit": "calendar year",
    "definition": "Outcome and realised exposure year",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "collisions",
    "unit": "event count",
    "definition": "Police-reported personal-injury collisions at road location; includes non-motor-only events; not insurance claims",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "motorMiles",
    "unit": "motor vehicle miles",
    "definition": "DfT all-motor, all-road annual authority exposure; no population allocation",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "incomeScore",
    "unit": "fraction",
    "definition": "Published income domain average score, historical vintage",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "employmentScore",
    "unit": "fraction",
    "definition": "Published employment domain average score, historical vintage",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "deprivationVintage",
    "unit": "release year",
    "definition": "2015 or 2019 edition available before forecast origin",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "deprivationPublished",
    "unit": "ISO date",
    "definition": "Publication date of deprivation edition",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "lagYear",
    "unit": "calendar year",
    "definition": "Outcome year minus two",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "lagCollisions",
    "unit": "event count",
    "definition": "Same-authority personal-injury collisions two years earlier",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "lagMotorMiles",
    "unit": "motor vehicle miles",
    "definition": "Same-authority exposure two years earlier",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "lagCarTaxiShare",
    "unit": "fraction",
    "definition": "Cars/taxis miles divided by all-motor miles at lagYear",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "lagLogMilesPerRoadKm",
    "unit": "natural log",
    "definition": "Log of lagged motor miles / road length in kilometres",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "population2011",
    "unit": "residents",
    "definition": "Fixed Census 2011 population; not exposure",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "populationDensity2011",
    "unit": "residents per km²",
    "definition": "2011 population / (published hectares / 100)",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "ageUnder25Share2011",
    "unit": "fraction",
    "definition": "Residents under 25 / own Census age-table population",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "age65PlusShare2011",
    "unit": "fraction",
    "definition": "Residents 65+ / own Census age-table population",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "noQualificationsShare2011",
    "unit": "fraction",
    "definition": "2011 residents aged 16+ with no qualifications / residents aged 16+; not driver education",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "level4PlusShare2011",
    "unit": "fraction",
    "definition": "2011 residents aged 16+ with Level 4+ qualifications; retained but not the education feature fitted here",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  },
  {
    "field": "logDensity2011",
    "unit": "natural log",
    "definition": "Log of 2011 population density",
    "missing": "No missing numeric input accepted in the frozen modelling cohort; exclusions are recorded separately."
  }
]