Familywise error rate

In statistics, family-wise error rate (FWER) is the probability of making one or more false discoveries, or type I errors when performing multiple hypotheses tests. In statistics, family-wise error rate (FWER) is the probability of making one or more false discoveries, or type I errors when performing multiple hypotheses tests. Tukey coined the terms experimentwise error rate and 'error rate per-experiment' to indicate error rates that the researcher could use as a control level in a multiple hypothesis experiment.