Bonferroni adjustment. When there are many dependentents, some univariate tests might be significant due to chance alone. That is the nominal .05 level is not the actual alpha level. Researchers may adjust the nominal alpha level. Actual alpha = 1 - (1-alpha1)(1-alpha2)...(1-alphan), where alpha1 to alpha-n are the nominal levels of alpha for a series of post hoc tests. For instance, for a series of 4 tests at the nominal alpha level of .01, the actual alpha would be estimated to be 1-.994 = .039. One wants an actual adjusted alpha level of at least .05.