The values in F.mgh are F dist under the null. But you should only have an F there if it is a multivariate contrast (ie, the contrast matrix has more than one row).
doug
Don Hagler wrote:
Are you sure that it is saving t-values in F.mgh and not F-stats?
From: Glenn Lawyer d.g.lawyer@medisin.uio.no To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] t-value saved values Date: Thu, 20 Sep 2007 15:00:44 +0200
Hi,
I asked about this last week, and had a nice discussion with Doug, but somehow in that we never got the answer to my original question.
When FreeSurfer saves t-values (in F.mgh), what is it actually saving? The numbers in the file do not have a t-distribution (even when the source data for the glm is random noise). Is a transform applied to the t-values before the write, as is done with the p-values?
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