Hi
I'd like to find out the relationship between GM volume, psychological scores and age.
Instead of demean age and scores, can I just add another EV( all 1 ) and not demean any of them?
So that...
EV1( psychological score ) just put the original so cores without demean
EV2( age ) just put the original age without demean
EV3( just put "1" for every subject )
By adding this extra EV3, I guess I don't have to demean any value?
Is that okay?
Thanks.
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