Hello
I want to find out the correlation between psychological scale and gray matter meanwhile control for age, gender and total gray matter.
So in my GLM design:
EV1=score EV2=age EV3=gender EV4=total gray matter
Contrast1: EV1=1 EV2=EV3=EV4=0
Contrast2: EV1=-1 EV2=EV3=EV4=0
However, does it matter if EV1(score) is correlated with EV4(total gray matter)?
Should I change my design if EV1 is correlated with EV4?
THANKS a lot!
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