<P> Randomised response is a research method used in structured survey interview . It was first proposed by S.L. Warner in 1965 and later modified by B.G. Greenberg in 1969 . It allows respondents to respond to sensitive issues (such as criminal behavior or sexuality) while maintaining confidentiality . Chance decides, unknown to the interviewer, whether the question is to be answered truthfully, or "yes", regardless of the truth . </P> <P> For example, social scientists have used it to ask people whether they use drugs, whether they have illegally installed telephones, or whether they have evaded paying taxes . Before abortions were legal, social scientists used the method to ask women whether they have had abortions . </P> <P> The concept is somewhat similar to plausible deniability . Plausible deniability allows the subject to credibly say he did not make a statement, while the randomized response technique allows the subject to credibly say he had not been truthful when making a statement . </P>

Which of the following is not true about the randomized-response model