High Quality Content by WIKIPEDIA articles! In statistics, familywise error rate (FWER) is the probability of making one or more false discoveries, or type I errors among all the hypotheses when performing multiple pairwise tests. The m specific hypotheses of interest are assumed to be known, but the number of true null hypotheses m0 and of alternative hypotheses m1, are unknown. V is the number of Type I errors (hypotheses declared significant when they are actually from the null distribution). T is the number of Type II errors (hypotheses declared not significant when they are actually from the alternative distribution). R is an observable random variable, while S, T , U, and V are unobservable random variables.

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