Abstract
We discuss a number of privacy protection measures in situations where people are asked highly confidential questions concerning a quantitative sensitive variable. Most of the discussion will be devoted to the measures proposed by [8,11,12,30,31] with particular reference to the trade-off between the level of privacy disclosure and the efficiency of the estimates.
Determination of the optimal sample size which would allow researchers to attain a predetermined level of efficiency and privacy is also considered.
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