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Hi there, I am interested in adding a covariate (age) to my FEAT higher-level analyses, but consistently receive error messages when I do so. Specifically, I am looking for a group difference between patients and controls, so have set up a 2-sample unpaired T-test. Then I've added a third EV for age. I've orthogonalized this w.r.t. EV1 and EV2. This is where I get an error. Finally, how does FEAT cope with entering a covariate for which 1 subject for instance may be missing a value for that measure? Thanks in advance. AMDC