Hello Freesurfers,
My apologies for this very basic question more about statistics than freesurfer, but I have not found an answer anywhere on the wikis, or the web (maybe it is too basic :-) ) I am interested in age-related effects of hiv and I wanted to covary for age and education in mri_glmfit. For example, if my fsgd file is:
class control class hiv variables age ed input subj1 control 40 13 input subj2 hiv 35 12 ... ...
and I use dods, is my contrast matrix the place where I would tell it to covary? Something like: 0 0 -1 1 1 1 1 1 (y-int) (age slope) (covary for age) (covary for ed)
As always, thank you for your help, Jeff
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