Hello Doug,
Below you suggested that I can calculate percent difference if I create a
contrast of group1 vs 0 and same group2, for cortical thickness. Does this
applies to Area and Area.Pial as well?
About my contrasts for my qdec analysis I have two levels two covariates
So my contrasts look: 1 -1 0 0, etc.
So should I keep the two regressors corresponding to the two variables (1 0 0
0)?
Or it should it be like this:(1 0)?
Thanks,
Pablo
Date: Fri, 28 Aug 2015 10:41:30 -0400
From: gr...@nmr.mgh.harvard.edu
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] Magnitude of group difference
There are a couple of things you can do.
You can create a contrast for each group separately, then compute
the voxel-wise percent difference between the maps, eg,
fscalc group1/gamma.mgh pctdiff group2/gamma.mgh -o pctdiff.mgh
You can compute the percent differences from the average in the
cluster. For this you'll need to load the y file for the clusters
and sort the subjects (rows) into groups and compute the precentage
difference.
On 8/28/15 4:54 AM, pablo najt wrote:
Hello FS experts and all,
I would like to find out the magnitude of the group
difference between a two-group comparison (e.g. percent
difference on cortical thickness indicating how much one group
differs from the other.) I have run analysis using both
mri_glmfit and qdec, I also run cluster wise correction for
multiple comparisons but in my summary tables I am not finding
this information. Do I need to run any additional command to
find out about this?
Thank you
Pablo
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