Hello Freesurfer's, I am using QDEC and I have created and FSGD descriptor file with 2 groups (pts and ctrls) and three continuous variables: age, IQ and mean thickness. I have 2 questions:
1. I can only choose 2 covariates at one time? How can I choose all three covariates in one model in my design? 2. I tried group and 2 covariates combinations to check if it runs ok and found that when I select age and IQ, it runs...when I select IQ and mean thickness it runs but it fails when I try running with age and mean thickness in the model? The error in the terminal says matrix not correct, check duplicates..., etc.. What I am doing wrong? Thanks, Manish Dalwani
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