There are two ways to do a paired-t. The easiest, I think, is to use the
--paired-t option to mris_preproc. The other option is to set it up in
the fsgd file, but that's more complicated and less flexible. What do
you mean by "group"? A class in the fsgd gets it's on mean regressor and
possibly slope regressor. Eg, if you have two groups: male and female,
and you want to analyze taking into account handedness, then you'd have
4 classes: ML, MR, FL, FR.
doug
Reschke, Cole wrote:
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
------------------------------------------------------------------------
_______________________________________________
Freesurfer mailing list
Freesurfer@nmr.mgh.harvard.edu
https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
--
Douglas N. Greve, Ph.D.
MGH-NMR Center
[EMAIL PROTECTED]
Phone Number: 617-724-2358
Fax: 617-726-7422
In order to help us help you, please follow the steps in:
surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
_______________________________________________
Freesurfer mailing list
Freesurfer@nmr.mgh.harvard.edu
https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
