Post hoc test after 3dLME

In our study we have 4(levels) groups and 2(levels) conditions so we looked at the main effect of group x condition.
Now we want to look at the post-hoc that is the group differences between any 2 groups, to do that we have extracted the beta values form the regions of group x conditionresults and performed ANOVA in SPSS.
Would this be a right way of showing the post-hocs or should we just do the post-hoc ttest in AFNI using 3dLME model of group x condition?

Jung

Would this be a right way of showing the post-hocs or should we just do the post-hoc ttest in AFNI using 3dLME model of group x condition?

It would be more preferable to obtain all the effects from one unified model. So 3dLME is the way to go for those post hoc tests.

Are these post hoc tests produced by 3dLME by itself or do we have to specify this?

For example I have group1 (condition1 condition2) group2 ( (condition1 condition2) group3 (condition1 condition2) so to look at the group difference between group1 and group2 for condition difference condition1 and condition2, I would have to do this

-gltLabel 1 group1_2 -gltcode 1 ‘group: 1group1 -1group2 Condition : 1condition1 -1condition2’

or 3dLME would auto generate this for you?

Jung

You have to specify all the post hoc tests. 3dLME and 3dMVM only provide those main effects and interactions.