Hi AFNI gurus,
Using 3dttest++ with a single array covariate (age) and a voxel-wise covariate (VBM-derived indices of grey matter volume) to compare depressed and non-depressed groups with respect to a novel DTI measure (center = SAME for both covariates), we observed a nice between-groups difference. To further understand this finding, what we'd like to do is pull the residuals (i.e., the DTI index once effects of age and VBM noise covariates have been addressed) for the cluster in which we found the between groups difference and correlate these residuals against some behavioral and cytokine data. I wonder, then, if you have a procedure you'd recommend for computing residual maps for individual subjects from which we could pull values?
Understood if this is not possible with current AFNI utilities.
All the best,
Paul
Edited 1 time(s). Last edit at 03/11/2015 11:32AM by rick reynolds.
