there is a tutorial with similar variables available here

https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/GroupAnalysis

Trisanna

--
Ph.D. Candidate
McGill University
Integrated Program in Neuroscience
Psychology


On Wed, Oct 5, 2016 at 9:22 AM, charles laidi <medcharlesla...@gmail.com>
wrote:

> Dear FreeSurfers,
>
> I would like to study the interaction between age and cortical thickness
> in patients and controls.
> My hypothesis is that there is an interaction and that cortical thickness
> is decreasing faster with age in patients than in controls.
> I have both Male and Female included in 6 different centers.
> I would like to consider also Gender and Site (6 centers) as confounds.
>
> My understanding is that I should perform a surface based group analysis
> with freesurfer.
>
> I am not able to find an example for my problem in the documentation
> https://surfer.nmr.mgh.harvard.edu/fswiki/Fsgdf2G0V
>
> Would anyone had some tips to build the Fsgd file and the contrast file ?
>
> Thank you very much in advance.
>
> Best,
>
> Charles
>
>
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