External Email - Use Caution Thanks. When I run mri-glmfit I get Error: matrix is ill-conditioned or badly scaled.
I have normalised the continuous variable Age. Kind regards, Marie ________________________________ From: freesurfer-boun...@nmr.mgh.harvard.edu <freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of Greve, Douglas N.,Ph.D. <dgr...@mgh.harvard.edu> Sent: 03 July 2019 15:24 To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Qdec Message to Mailing List yes, qdec can only have 2 factors with 2 levels. both qdec and mri_glmfit are linear methods (in fact, qdec just calls mri_glmfit). On 7/3/2019 9:39 AM, Marie Hill wrote: External Email - Use Caution Dear Sir/Madam, Could I post the following message to the mailing list: I am running a regression testing for significant difference in cortical volume, thickness etc with 3 factors: diagnosis, genotype and gender, with age as a nuisance factor. I am using qdec but receiving Error: factor 2 must have 2 levels. Is it true that Qdec only supports factors with 2 levels? There is a page for qdec levels stating to create a file diagnosis.levels and state the three levels. I did this however the same error occurs. I was going to use glm_fit instead but I think my study isn't a linear regression so isn't suitable (as I am not interested in the change with age, just between groups). Kind regards, Marie _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu<mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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