Dear all,
I'm looking for some help with longitudinal study.
I have 1 group and 2 scans of GM for each subject but time between scans is different,
than I select Flex Factorial design with 2 factors (subject ,time), 2 covariates (Time After First Study, Age) and calculated globals for each scan.
Im not sure how to interpret contrasts:
variables
time1,time2,TAFS,Age,subj,...subj,globals
t-contrasts:
1,-1,0,0,... : can I say that is 'loss' of GM ?
-1, 1, 0,0...: that is 'grow' ?
-1,1,1,0.... :
-1,1,-1,0....:
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Thanks,
Aleksey Rublev
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