Unknown Repeated Trials in the Unrelated Question Randomized Response Model

This paper proposes a modified randomization device for collecting information on sensitive issues. The estimator based on the suggested strategy is found to be unbiased for population proportion and is better than the Greenberg et. al.'s (1969) estimator. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)