Note On "the Randomized Response Approach"

This addendum updates Fox and Tracy's (1980) summary of work on the randomized response technique (RRT). It notes the recent development of an additive constants model for sensitive questions that require a numerical response. It further calls the reader's attention to the possibility of correlational research using RRT models by presenting the derivation of the correlation and correction for attentuation between two variables measured by the additive constants model and by noting a paper that does the same for several other RRT models.