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Dear Freesurfer experts,
I want to run a GLM to analyze the correlation between a continuous variable Y and a morphometric measure (eg. Cortical thickness). I want to control for some nuisance variables: sex, scan site, age, age squared, age * sex interaction, head size.
1. How should I go about formulating the FSDG file? 2. What should my design matrix be if I am only interested in the relationship between Y and the morphometric measure of interest after controlling for the various nuisance variables?
Thank you so much for the help!
Yours, Sophia