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The impacts of disclosure control on Census analysis

The impacts of disclosure control on Census analysis. Paul Williamson University of Liverpool, UK [P.Williamson@liv.ac.uk]. v. 1. The need for SDC. 2. Census data under attack?. Pre-2001 SDC measures 2001 SDC measures. 0 1 2 3 …. 2. Census data under attack?.

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The impacts of disclosure control on Census analysis

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  1. The impacts of disclosure control onCensus analysis Paul Williamson University of Liverpool, UK [P.Williamson@liv.ac.uk]

  2. v 1. The need for SDC

  3. 2. Census data under attack? • Pre-2001 SDC measures • 2001 SDC measures

  4. 0 1 2 3 … 2. Census data under attack?

  5. 3. Impacts of disclosure control

  6. 3. Impacts of SDC • ONS • Simpson • Others • Problem… • Population rarity

  7. 3. Impacts • Solution: • Summarise impact of SDC by • table/count type

  8. 3. Impacts • Solution: • Summarise impact of SDC by • table/count type • population rarity • level of geographical aggregation • method of SDC • type of analysis

  9. 95% Confidence Intervals

  10. 4. Responses to SDC • (a) Counts • Univariate counts  marginals • Largest possible building blocks • Minimise spatial units used

  11. 0 1 2 3 … 5. Conclusion

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