Hi all,
This is a simple question but unsure of the interpretation. I have one group in TBSS and want to look at the interaction of two covariates on FA. So I have
EV1:Cov1 EV2:Cov 2
74 25
42 24
55 22
etc etc
From what I have gather from the GLM setup instructions I should have my contrasts as:
Title EV1 EV2
C1 +1 -1
C2 -1 +1
Unsure what the interpretation of this would be. Would a significant C1 cluster represent covariate 1 has a positive correlation with FA? Or that C2 has a negative correlation with FA? Should I set it up as:
Title EV1 EV2
C1 +1 +1 <--- The interaction of covariates is positively associated with FA
C2 -1 -1 <--- The interaction of covariates is negatively associated with FA
Cheers,
Sean Hatton
Brain & Mind Research Institute
University of Sydney
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