Measures to prevent disclosure have an impact on data quality l Measures to prevent disclosure: l Thresholds for census areas l OAs 40 hh and 100 residents l Broad output categories l No SARs sub-regional geography; no large households l Imputed records not distinguishable l Record swapping between areas l July 2002: Adjust small numbers to eliminate all 1s and 2s l Table totals the sum of internal cells l Different tables, different totals
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