Comments on a method of comparison of randomized response techniques

In a forthcoming paper (A unified framework for analysis and comparison of randomized response surveys of binary characteristics, J. Stat. Plan. Infer., doi:10.1016/j.jspi.2008.12.013) Nayak and Adeshiyan (2009) claimed, among other things, that all randomized response techniques with three or more response categories are essentially of no or little value. In this note, we provide some very brief comments on their claim.