I'm going to run some analyses and have some doubts with respect to
the general approach that I should follow. We want to evaluate
differences in cortical thickness in three different groups. Shoud I
perform an ANOVA (to know if there is a group effect) followed by
pairwise comparisons (to localize the difference)? If so, what should I
do if results from the ANOVA and pairwise comparisons are localized in
different regions? Shoud I restrict the pairwise contrasts to regions
where ANOVA revealed significant differences?
Many thanks in advance.
Best Regards
Gabriel
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