More is not always better: An experimental individual-level validation of the randomized response technique and the crosswise model.

For true positives, the ranking of the techniques changed in that direct questioning now performed best, with a true positive rate of about 70% (although the differences to the other techniques are not, or only marginally significant; the p values compared to CM, UQ, and FR are 0.23, 0.30, and 0.06, respectively).

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