I've got data from a 2x2 fully factorial, repeated measures design. The residuals are non-normal so I am looking for non-parametric equivalent of the 2-way repeated measures ANOVA. I know there isn't one available from the SPSS menus, but has anyone got any SPSS syntax that can perform this sort of test? There is apparently a way of doing this sort of test using the R software, but I can't get an understandable desription from anywhere as to how to do it, and I haven't really got any experience of the R software. So I was hoping someone might be able to help via SPSS.

My current solution to the problem is to use the parametric ANOVA and then 'check' the significant main effect findings using the non-parametric one-way Wilcoxon test. Not particularly kosher from the statistical point of view so I was hoping to find a cleaner method of doing the analysis.

Thanks

Rob