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Unconditional non-asymptotic methods for comparing two independent binomial proportions have the drawback that they take a rather long time to compute. This problem is especially acute in the most powerful version of the method (Barnard, 1947). Thus, despite being the version which originated the method, it has hardly ever been used. This paper presents… (More)

A 22 table may arise from three types of sampling, depending on the number of previously fixed marginals, and may yield three possible, differing, probabilistic models. From the unconditional point of view each model requires a specific solution but, within each model, the calculation time increases as the test procedure chosen is more powerful, and,… (More)

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