A modification to Warner’s (1965) Randomized Response Model is suggested. The suggested model is more efficient than the original model.
Gupta, Sat and Shabbir, Javid
"An Alternative to Warner’s Randomized Response Model,"
Journal of Modern Applied Statistical Methods: Vol. 5
, Article 6.
Available at: http://digitalcommons.wayne.edu/jmasm/vol5/iss2/6