Massieh,
A quick answer is to have a look at these pages:
http://surfer.nmr.mgh.harvard.edu/fswiki/FsgdExamples
and
http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/GroupAnalysis
The examples don't exactly match what you want, but you might be able to cull together what you need.
Nick
On Tue, 2009-08-04 at 08:41 -0400, mmoayedi@uhnres.utoronto.ca wrote:
Hello FreeSurfer Experts,
I am trying to run a contrast comparing 3 different classes, and using one covariate as follows (truncated for simplicity's sake!):
GroupDescriptorFile 1 Title CTA TMD Patients Low vs Patient High vs Controls Class Control plus blue Class Patient_Low circle green Class Patient_High cross red Variables Age Input c3 Control 25 Input c4 Control 27 .. .. .. Input p1 Patient_Low 22 Input p2 Patient_Low 20 .. .. .. Input p12 Patient_High 50 Input p13 Patient_High 59 Input p14 Patient_High 18
I was wondering how I can 1) Compare cortical thickness between the 3 groups, using the variable as a covariate of no interest and, subsequently, compare between the age slopes of the 3 classes.
Any (and all) help is greatly appreciated.
Regards,
Massieh Moayedi PhD Student Institute of Medical Science University of Toronto
Department of Brain, Imaging and Behaviour- Systems Neurosciene Toronto Western Research Institute University Health Network
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