Hi list,
I'm performing cortical thickness among 3 groups by using GLM.
I created a group descriptor file with 3 groups and 2 covariates (age and mean
thickness).
I performed 3 comparisons A-B, A-C, B-C.
Now, for one of 3 groups (group C) I have:
groups C=30 subjects; I'd like to divide it in some pairs.
First pair: X (n=15) vs Y (n=15). Second pair: Z (n=15) vs W (n=15). Between
first and second pair there isn't interactions.
X or Y subgroup can contain also subjects included in Z or W.
Z or W subgroup can contain also subjects included in X or Y.
Design:
group A
group B subgroup X vs subgroup Ygroup C ------<
subgroup Z vs subgroup W
I'm thinking to perform qdec for X-Y and Z-W. Is it correct?
What do you advise me?
Thanks,
Stefano
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