Thank you.
Pablo
From: pablonajt@hotmail.com
To: freesurfer@nmr.mgh.harvard.edu
Date: Thu, 1 Oct 2015 11:47:10 +0000
Subject: [Freesurfer] percent difference adjust to results {Disarmed}
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From: pablonajt@hotmail.com
To: freesurfer@nmr.mgh.harvard.edu
Date: Thu, 1 Oct 2015 11:47:10 +0000
Subject: [Freesurfer] percent difference adjust to results {Disarmed}
Dear FS experts
I have a query about how can I make that the percent difference results matches the same clusters of my output from my main glm analysis.
I run a glm analysis g4v1 (Male_Pt, Male_HC, Fem_Pt, Fem_HC) with Age and sex as covariates.
My contrasts are as follow
-0.5 0.5 -0.5 0.5 0 0 0 0
This contrast is meant to test "is there a difference between HC and PT controlling for age and sex.
I separately run contrast of PT agains "0"
0.5 0 0.5 0 0 0 0 0
and HC against "0"
0 0.5 0 0.5 0 0 0 0
calculated percent difference as follows
fscalc Pt_group/gamma.mgh add HCgroup/gamma.mgh div 2 -o group.mean.mgh
Then computed the percent difference:
fscalc HCgroup/gamma.mgh sub Pt_group/gamma.mgh div group.mean.mgh mul 100
-o pctdiff.mgh
Now when I open my results from the first contrast above and the pctdiff.mgh separately, I am not quite sure they match. How could I adjust the min and saturation values to make them match and show how much percent difference is between the groups in the cluster shown in the main contrast. I have embedded the two results and parameters to give you an idea of how I am setting this up and if there is anything I can tune to improve visualisation.
Thank you very much in advance.
Pablo
results from main contrast
pctdiff
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