Dear All,
I have a very similar question to that posted by Steven Grant on June 9th.
I have two groups of subjects who, on prescreening, exhibited differential
mood responses (one group positive scores, the other negative) to a drug.
So with 2 groups (positive and negative responders), 2 conditions (drug
and placebo), 1 scan/subject under each condition, and 1 covariate (mood
score) collected/scan, how would I go about determing whether rCMglu is
affected by:
1) prescreening mood scores within group
2) post drug scan mood scores within group
and also whether:
3) mean centering of the covariate is useful/necessary in these cases
4) mean should be computed within group or across all subjects
Thank you for your help!
Leann Kinnunen
University of Chicago
Department of Psychology
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