afni.nimh.nih.gov

Hello,
What is the easiest way to test a Group X Gender interaction? This means there are 2 between-subjects variables, producing 4 separate groups (Group1 Male, Group1, Female, Group2 Male, Group2Female). In GroupAna, if I choose a 3-factor ANOVA (with subjects as a random factor), there is no option to run an ANOVA with 2 between-subjects factors. Can I use 3dANOVA to test 4 between-groups differences ? Or is 3dANOVA only appropriate for within-subject factor tests?

Thanks for the help,
Helen