qdec currently only supports two levels to a group. i thought qdec issued a better error message in this case, so that will need to be improved.

to do a three-level group analysis, you will need to do it manually. see:

http://surfer.nmr.mgh.harvard.edu/fswiki/FsgdExamples

and

http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/GroupAnalysis

n.

On Fri, 2010-05-28 at 13:18 +0200, Jordi Delgado wrote:

Dear Experts,

I'm trying to use QDEC for a Multigroupal analysis. I've read in the wiki that QDEC uses a GLM method to perform the analysis, but when I load a table with 43 subjects aprox. of three different groups and I run the analysis, at 70% QDEC shows me the following error:

Error in Analyze: command failed: mri_glmfit --y ../path/qdec/qdecUntitled/y.mgh --fsgd ../path/qdec/Untitled/qdec.fsgd dods --glmdir ../path/qdec/Untitled --surf fsaverage lh --label ../path/fsaverage/label/lh.cortex.label

Any idea?

Thank you in advance,

-- Jordi Delgado Mengual PIC (Port d'Informació Científica) Campus UAB, Edifici D E-08193 Bellaterra, Barcelona http://www.pic.es Avis - Aviso - Legal Notice: http://www.ifae.es/legal.html _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer