Australia reports registered vehicle stock on the census date, not sales or new registrations; Great Britain reports first registrations during a calendar quarter. These facts are not directly comparable.
- Metric definitions differA stock-at-census measure and first-registration events describe different facts.
- Statistical subjects differThese facts measure different vehicle populations or subjects and cannot be treated as observations of the same thing.
- Time grains differThese facts use different reporting periods or census dates, so they cannot produce a like-for-like result.
- Coverage scopes differThe sources cover different geographies, vehicles, or registration scopes and cannot be combined directly.
- No approved derived computationThe original facts are authorized for display, but no calculated result is authorized for this pair.
- No approved comparison ruleThe versioned policy has not explicitly approved this market-and-metric set, so the system denies it by default.