Hi,
I have an fMRI study to analyze covarying for age. We have 2 groups,
control(n=20) and patient(n=14) each with 8 conditions. These conditions
are modeled in the 1st stage fixed effects level for each subject
(=con.img).
Is it reasonable to model all the condition and subjects in one anCova
model in the second stage?
Would I state 2 groups, 1st has 20*8=160 con.img files the 2nd group
having 14*8=112 con.img files ?
Or would I state 16 groups?: condition1group1 condition2group1
condition3group1.....condition1group2 condition2group2.....
Is it more correct to compare each condition within a 2 group design
seperately, so I would run 8 seperate ancova analyses.
Thanks for your time and attention.
Maria
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