{ "feature": "cars_per_household_lower_bound", "metadata": { "id": "cars_per_household_lower_bound", "label": "Cars/vans per household \u00b7 lower bound", "family": "Housing and vehicles", "source": "ts045", "numerator": [ [ 5, 1 ], [ 6, 2 ], [ 7, 3 ] ], "denominator": [ 3 ], "unit": "vehicles/household", "role": "candidate", "note": "Top-coded 3+ category is assigned 3. This is a lower bound, not an exact vehicle count.", "status": "complete", "zeroBand": false, "comparability": "Common source and calculation across England and Wales", "direction": "Higher band = higher feature value; collision-risk direction has not been tested", "observationPeriod": "2021-03-21", "geographicResolution": "LSOA2021, England and Wales", "licence": "Open Government Licence v3.0", "sourceStatus": "Frozen archived input", "numeratorColumns": [ { "column": "Number of cars or vans: 1 car or van in household", "weight": 1 }, { "column": "Number of cars or vans: 2 cars or vans in household", "weight": 2 }, { "column": "Number of cars or vans: 3 or more cars or vans in household", "weight": 3 } ], "denominatorColumns": [ "Number of cars or vans: Total: All households" ], "releasedAt": "2023-01-06T00:00:00.000Z", "sourceUrl": "https://www.nomisweb.co.uk/output/census/2021/census2021-ts045.zip", "validCount": 35672, "missingCount": 0, "bandScheme": "Combined E&W deciles", "sourceVersion": "ew-v1", "phase": "Original 1\u20132", "mileageAllocationUse": "No direct use identified in current pilot; nationwide allocation audit pending", "bandedCount": 35672, "bandsWithheld": false, "releaseDecision": "banded", "definition": "(Number of cars or vans: 1 car or van in household + 2 \u00d7 Number of cars or vans: 2 cars or vans in household + 3 \u00d7 Number of cars or vans: 3 or more cars or vans in household) / (Number of cars or vans: Total: All households)", "denominatorDefinition": "Number of cars or vans: Total: All households", "qualityFlags": [ "banded", "retrospective_mixed_vintage", "not_claims_validated" ], "featureFreezeVersion": "ew-v4", "frozenBandsAvailableFrom": "2026-10-12", "historicalAsOf2022Eligible": false, "claimsValidation": false, "predictiveValidation": false, "sourceRegisterUrl": "/research/ew-deciles/v1/source-register.json", "readiness": "calculated research feature; prediction untested", "historicalForecastEligibility": "Exact archived edition and these bands were frozen on 2026-10-12. Historical as-of availability is not certified. Retrospective research only until the forecast-origin audit passes." }, "tested": true, "screeningFamily": "novel candidate", "nationalLSOAs": 35672, "nationalNumericLSOAs": 35672, "nationalBandedLSOAs": 35672, "metrics": [ { "feature": "cars_per_household_lower_bound", "form": "linear", "scenario": "fitted", "sample": "temporal_2023", "rows": 33108, "lsoas": 33108, "zeroRows": 7587, "observed": 92703, "expected": 97377.70039267276, "baseExpected": 97536.70796420943, "oe": 0.9519941385571628, "baseDeviance": 70909.04750319224, "featureDeviance": 65607.68884596555, "gain": 0.07476279605910707, "lower95": 0.06350321880190465, "upper95": 0.08617198307560402, "blocks": 162, "unsupportedRows": 0, "conditionalFixedPredictions": true }, { "feature": "cars_per_household_lower_bound", "form": "linear", "scenario": "fitted", "sample": "region_East Midlands", "rows": 5694, "lsoas": 2847, "zeroRows": 1329, "observed": 15424, "expected": 16196.51878570112, "baseExpected": 17021.64703151101, "oe": 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