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I am looking to run freesurfer group analysis on a longitudinal study, examining the changes between baseline and follow-up. I would like to set up a paired t-test, yet I am still in need of some assistance creating my FSGD file and my design matrix. I have read the GroupAnalysis wiki page, and did not see anything regarding t-tests. Also, is "Class" is equivalent to "Group" in the FSGD file? I have been using your sample GroupDescriptorFile to create my own, and pasted an excerpt below (my edits are in red and underlined). GroupDescriptorFile 1 Title MyTitle Class bsl plus blue Class flp circle green Variables Age Gender Input subjid1 bsl 20 M Input subjid1 flp 20 M DefaultVariable Age Cole Reschke Data Manager, PET Center Banner Alzheimer Institute Banner Good Samaritan Medical Center Phone: (602) 239-4868
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