In SPSS, when I run a two-way mixed-effects ANOVA (with factor A fixed and factor B random), the between subjects effects table reported by SPSS uses mean square for the interaction (MS_AB) as the error term for testing the main effect of factor B, the random factor. According to Keppel and Wickens (2004) and Maxwell and Delaney (2004, p. 477) the error term for the main effect of factor B, the random factor, should be MS_within:
Am I missing something or is this an error in SPSS's reporting?
Best Answer
I had also posted this on the SPSSX listserv and got the following link from a response by Bruce Weaver: