Hello spmers,
I ran a multiple regression analysis on my VBM data.
I entered 4 covariates
(group 1) cov 1= 15*1 25*0
(group2) cov 2= 15*0 25*1
(group1 covariates) cov 3= 15 psych_scores 25*0
(group2 covariates) cov 4= 15*0 25 psych_scores
I need to look at:
gray matter in group1 > group2 when positively correlated with the covariate.
I'm sure it's a simple question but I'm not sure if [1 -1 1 -1] is correct.
Thank you very much, for your time and assistance,
Maria
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