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Estimated record level risk for the CVTS

Estimated record level risk for the CVTS. Liv Belsby and Stuart McAllister Statistics Norway and Eurostat. The Goal was to assess the anonymisation The anonymisation was agreed on by Eurostat and the National Statistical Institutes We based the assessment on record level risk.

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Estimated record level risk for the CVTS

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  1. Estimated record level risk for the CVTS Liv Belsby and Stuart McAllister Statistics Norway and Eurostat

  2. The Goal was to assess the anonymisation • The anonymisation was agreed on by Eurostat and the National Statistical Institutes • We based the assessment on record level risk

  3. Intruder scenario • NACE, number of employees and involved in take over or not are used as identifying variables • Possible external information source is The European Business Registers (Internet site www.ebr.org) • Includes Belgium, Austria, Denmark, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Norway, Spain and Sweden

  4. Estimation • The total number of companies within each stratum defined by NACE and size is known, say N(s) • No superpopulation model assumed • The total number with id. var. NACE, size and take over or not N(s,i), i equals 0 or 1, is unknown • Estimator E(1/N(s,i) | sample data, N(s)) • The companies, which are not in the sample: N(s) – n(s) binomial distributed – outcome involved in take over or not

  5. NorwayIdentifying variables:NACE,size & take over or not NACE & size

  6. SpainIdentifying variables:NACE,size & take over or notNACE &size

  7. UKIdentifying variables:NACE,size & take over or notNACE & size

  8. Conclusion Some further anonymisation is needed

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