I have two classes (patients and healthy volunteers) and one variable (age), if I want correct for age the difference in cortical thickness between these two groups it is enough to write 1, -1, 1 in the contrast vector?
thanks
Valentina
-----Original Message----- From: Doug Greve [mailto:greve@nmr.mgh.harvard.edu] Sent: Friday, December 15, 2006 12:08 PM To: Durastanti, Valentina (NIH/NINDS) [F] Cc: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] parametric map
You can use age as a covariate in a regression (make sure to demean them).
doug
On Fri, 15 Dec 2006, Durastanti, Valentina (NIH/NINDS) [F] wrote:
Hi, I' compared the regional cortical thickness between two groups of subjects using the statistical parametric maps provided by Freesurfer.
I
was wondering if there is a way to correct the analysis for the age
(the
two groups of subjects differ for age) or if the Freesurfer already do that. Thanks Valentina
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