Thanks Doug! 

If i wanted to add a third time-point, what would u suggest would be a good method to use for time x group interaction?

Harry

From: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] on behalf of Douglas N Greve [greve@nmr.mgh.harvard.edu]
Sent: Wednesday, 10 October 2012 1:10 AM
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] 3 Factor glm group analysis

Hi Harry, I would do a time1-time2 subtraction (fscalc) and then do a 2
group analysis (search for "paired" on our wiki).
doug

On 10/09/2012 12:45 AM, hhal5293@uni.sydney.edu.au wrote:
Hello,

We are currently doing a longitudinal Group
 Analysis using
FreeSurfer,
and were wondering if there is a way to run a 3 factor design (time is
2 levels, group is 2 levels, subject is 10 levels) using the
mri_glmfit model, as i want to test the time by group interaction? Is
there a way of writing this model in an FSDG file? If we can't do this
using mri_glmfit, is it possible to do this using QDEC?

Regards,
Harry

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Douglas N. Greve, Ph.D.
MGH-NMR Center
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