Skip to main content
. 2015 Mar 24;40(2):172–176. doi: 10.5395/rde.2015.40.2.172

Table 1. Type I error rates according to the range of comparison.

Category Definition
Type I error rate per comparison (αPC) Probability of incorrect rejection of true null hypothesis when a comparison is tested
Family-wise type I error rate (αFW) The probability of type I error occurs when a set (family) of tests is performed