Hi all
I'm doing a VBM longitudinal data analysis in two groups with two time points. I followed the cat12 tutorial regarding longitudinal data in two groups and i have done the F test to explore a main effect of group using the contrast suggested in the tutorial.
Now i'm trying to compare one group against the other using both time points (t test) but the tutorial does not provide a contrast for that. I tried 1 1 -1 -1 but cat12 doesn't accept this contrast as valid one.
Do you have any suggestion how to do this?
Thank you
Nádia Canário
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