From greve@nmr.mgh.harvard.edu Thu Mar 18 19:04:15 2010
From: Douglas N Greve <greve@nmr.mgh.harvard.edu>
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] Replicating qdec analysis with more than 2
 continuous variables
Date: Thu, 18 Mar 2010 19:04:14 -0400
Message-ID: <4BA2B16E.20306@nmr.mgh.harvard.edu>
In-Reply-To: <44094C9FB8ABA1459771F7247AC60DF30AC093F80A@EX01.net.ucsf.edu>
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Yuo can't do it in QDEC, but you can do it by calling mri_glmfit 
directly and creating an FSGD file. Do a search for FSGD on our wiki for 
more info.

doug

Laluz, Victor wrote:
>
> Hello Freesurfer folks,
>
>  
>
> I hope this question is simple to answer: Is there any way to do a 
> surface-based group analysis, a-la qdec, without the limitation of 2 
> continuous variables?
>
>  
>
> My goal is to analyze a thickness relationship with continuous 
> variable X, which I have so far analyzed controlling for variable Y. 
> However, I ALSO want to control for variable Z. As it is in qdec, it 
> forces me to select only 2 of either X Y and Z.
>
>  
>
> I have tried converting one of the variables to a discrete factor, but 
> the results do not look the same at all.
>
>  
>
> Any advice you can give will be very appreciated; and, as we are 
> currently working under a deadline of sorts, the sooner someone might 
> get back to me the better... as always, I really appreciate the help.
>
>  
>
> Victor Laluz : Imaging Coordinator : UCSF Memory and Aging Center
> 415-476-1680 : 415-476-1816 (fax)
>
>  
>
> ------------------------------------------------------------------------
>
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> Freesurfer mailing list
> Freesurfer(a)nmr.mgh.harvard.edu
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-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve(a)nmr.mgh.harvard.edu
Phone Number: 617-724-2358 
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html


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