Jeff, sig.mgh actually stores the -log10(p), not p, so to get the true p-value of say, -2 (in the sig.mgh), take 10^-2 (giving you the true p-value of 0.01).
Nick On Mon, 2009-06-08 at 16:48 -0600, Jeff Sadino wrote: > Hello Surfers, > > I am trying to verify the p-value sig.mgh maps outputted from the > mri_glmfit command as the first part of a more advanced analysis. We > have been extracting the thickness data for a single vertex from each > of our 58 subjects in two control groups and then running a > significiance analysis is SAS. We thought that the output from SAS > should match the p-value in the sig.mgh file, but the p-values do not > match at all. We have tested multiple data points. Does freesurfer > do some sort of a more advanced significance analysis that is not in > the standard documentation? > > Thank you very much, > Jeff Sadino > > > ______________________________________________________________________ > Windows Live™ SkyDrive™: Get 25 GB of free online storage. Get it on > your BlackBerry or iPhone. > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
