New subject: [External] Freesurfer Digest, Vol 190, Issue 3

3 Dec 2019

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Yes, absolutely, this should work! Many Thanks!
I have just one last question concerning the colors in FreeView.
I have a fsgd file with class 1 (patients) coming first and then class 0 (hc) after.
The contrast matrix is 1 -1 0.
Among the results I see blue and red regions in Freeview. Am I correct assuming that blue regions are the ones where cortical thickness is reduced in patients relative to HC (correcting for disease duration)?
I just wanted to ask for a confirmation.
Many thanks,
Pilar
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Message: 2
Date: Mon, 2 Dec 2019 16:06:54 +0000
From: "Greve, Douglas N.,Ph.D." DGREVE@mgh.harvard.edu
Subject: Re: [Freesurfer] Fw: Regression Analysis accounting for one
   variable
To: "freesurfer@nmr.mgh.harvard.edu" freesurfer@nmr.mgh.harvard.edu
Message-ID: c8973136-8b3d-801a-9e88-2d6b8fd396be@mgh.harvard.edu
Content-Type: text/plain; charset="windows-1252"
It sounds like it would be a one-group, two-variable situation, like this
https://surfer.nmr.mgh.harvard.edu/fswiki/Fsgdf1G2V
Is that not correct?
On 11/28/2019 5:24 AM, Ferraro, Pilar wrote:
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Hi,
I apologize if I did not explain my issue properly.
I'm interested in looking at age-related thickness reductions in 1 group (patients), but I'd like to also account for the effect of disease duration.
We can say that in my case disease duration is the nuisance factor.
Briefly, I have the same issue reported in here (https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg32860.html), but with only one group.
How would you recommend to proceed?
Many  thanks,
Pilar

Message: 2
Date: Wed, 27 Nov 2019 16:56:20 +0000
From: "Greve, Douglas N.,Ph.D." DGREVE@mgh.harvard.edumailto:DGREVE@mgh.harvard.edu
Subject: Re: [Freesurfer] [External] Freesurfer Digest, Vol 189, Issue
       36
To: "freesurfer@nmr.mgh.harvard.edu"mailto:freesurfer@nmr.mgh.harvard.edu freesurfer@nmr.mgh.harvard.edumailto:freesurfer@nmr.mgh.harvard.edu
Message-ID: fbb77a97-61b5-fac5-e2b3-0ee327e29ce3@mgh.harvard.edumailto:fbb77a97-61b5-fac5-e2b3-0ee327e29ce3@mgh.harvard.edu
Content-Type: text/plain; charset="utf-8"
what is the difference between and independent variable and a covariate?
On 11/27/2019 6:57 AM, Ferraro, Pilar wrote:
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Yes, I did.
But in this case I have two factors, not only one. In particular, I have an independent variable X and a covariate I?d like to include in the model.
How would you suggest to proceed?
Thanks,
Pilar

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Re: [Freesurfer] [External] Freesurfer Digest, Vol 190, Issue 3