All-

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