Follow-up Tests
When there is a significant interaction between a between-subject factor and a within-subject factor, statisticians often recommended pooling the between-subject and within-subject MSerror terms. This can be calculated in the following way:
MSWCELL = SSBSError + SSWSError / dfBSError + dfWSError
When following up interactions for terms that are both between-subjects or both within-subjects variables, the method is identical to follow-up tests in ANOVA. The MSError term that applies to the follow-up in question is the appropriate one to use, e.g. if following up a significant interaction of two between-subject effects, use the MSError term from between-subjects. See ANOVA.
Read more about this topic: Mixed-design Analysis Of Variance
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