Dear Doug, As you suggested yesterday, I launched the GLM to check for interactions group-age with the contrast: 0 0 +1 -1 And I obtained this image: [cid:7821658e-5306-4db9-bd66-19d03fb011c2] Then I re-launched my model including age as a covariate and I obtained very similar results: [cid:ff81c97d-3e7e-4781-909b-47b47a4b420c]
Finally, I re-launched the model excluding age and I obtained a very different thing, which is actually more consistent with my data: [cid:412e89f2-1097-4777-8a18-b54a7c0c06b4]
How shall I interpret this? Shall I exclude age from my analysis? (I do not really expect it to have an influence on my variable y)
Thank you, Vale ________________________________ From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu on behalf of Greve, Douglas N.,Ph.D. DGREVE@mgh.harvard.edu Sent: Wednesday, August 28, 2019 6:03 PM To: freesurfer@nmr.mgh.harvard.edu freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Fw: question on GLM
It is showing b = g2 - g1 so negative means that g1 > g2
On 8/28/19 1:59 PM, Barletta, Valeria wrote:
Forgot to report my contrast matrix:
-1 1 0 0
Thanks, Valeria
*From:* Barletta, Valeria *Sent:* Wednesday, August 28, 2019 1:02 PM *To:* Freesurfer support list freesurfer@nmr.mgh.harvard.edu *Subject:* question on GLM Good afternoon! I have a question on the Freesurfer GLM. The command:
mri_glmfit-sim --glmdir ${glm_dir}/${hemi}_contrast-${contrast}_${surfname_cme} --cache 1.3 neg
is giving me blue clusters (see attached picture). Do blue clusters mean that my variable y is LOWER in the FIRST or the SECOND group listed in the FSGD file?
Thanks, Valeria
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