We address the problem of sample size determination in many-one and pairwise multiple comparisons of proportions which are arcsin-root transformed. For one- and two-sided many-one comparisons, we provide the least favorable configuration which minimizes the all-pairs power. Corresponding explicit sample size formulas are given, also for the case of prior knowledge on the underlying success probabilities. The solutions for pairwise comparisons are restricted to the case k = 3.

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