Sorry if this question has already been asked:

I analyzed my data using a 2X2 repeated measures ANOVA and then did the same thing using a General Linear Model on the (excellent) GAMLj module. Surprisingly, results were very different: on the repeated measures ANOVA I got 1 sig. main effect and a sig interaction; on the GLM, I got 2 sig. main effects and a sig. interaction.

I am curious about what is going on here? Has anyone experienced a similar situation?

Thank you.

Tomás