It has been proven theoretically that repeated administration of two-related-question randomized response technique (RRT) substantially increases the efficiency by reducing the variance of the estimate. The realtive efficiency of RRT to direct question with various number of trials per respondent under various degrees of truthful response and various conditions has also been examined. However, if the respondent becomes more concerned about his anonymity, then the mean square error may be larger. A field study of limited scope conducted in Taichung, Taiwan indicated that this multiple trial RRT model is at least as feasible as, if not more feasible than, the conventional single trial RRT. There was no sign suggesting cooperation of respondents had deteriorated because each was asked to repeat the procedures three times. If the number of trials did not exceed three, we believe that the increase in the cost of survey and "exhaustion" of respondents from repeated administration of the same set of questions would be negligible. Hence, we believe that this multiple trial technique is a feasible and useful survey method for study of various contemporary social problems of sensitive nature. More field testing, particularly in different socio-cultural settings, is necessary however, before a general conclusion may be drawn.

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To investigate risk of stroke following use of oral contraceptives (OC) in less developed countries, a case-control study was conducted in Taiwan involving 323 cases hospitalized in 1978-1980, 250 hospital controls, and 646 neighborhood controls matched with cases on several variables. All were alive at interview. For the total sample, no increased risk was found. However, when comparison is with hospital controls, the risk for the recent OC users was increased (OR = 3.93, 95% C.L. 1.21, 5.46). This latter finding is consistent with studies in developed countries.

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. American Statistical Association is collaborating with JSTOR to digitize, preserve and extend access to Journal of the American Statistical Association.The Randomized Response Technique, which was originally developed for qualitative purposes, is being developed for quantitative purposes, and the current article presents a new discrete quantitative RRT model. This model uses a predetermined combination of balls in the randomizing device, instead of asking an innocuous question. It has been shown that the procedures of administering the model is simple and that its efficiency of estimate is higher than the other currently available models.