Abstract
The paper reconsiders and compares some randomized response models in the light of the efficiency/protection criterion. The
results show that, despite the assertion of the authors about the superiority of their methods, some procedures are perfectly equivalent
to theWarner’s or the Simmons’models. Ourwork extends and generalizes the results of Bhargava and Singh [2002. On the efficiency
comparison of certain randomized response strategies. Metrika 55, 191–197] and other authors
