[Freesurfer] Re: mri_glmfit and dofs

You only need to spec the dofs with a fixed effects analysis. If that's what you are doing, then you need to sum all the dofs from the lower level.

doug

ps. these types of questions are better to post to the freesurfer mailing list

Georg Homola wrote:

Hi Doug!

When performing surface-based group analysis with mri_glmfit, I have to specify the dofs of my feat runs. But when I correct for motion outliers on first level (by additional confound EVs identified by fsl_motion_outliers) there will be different dofs for every subject. Is a correct group analysis still possible? Which dof will be the right one then (the subject with the least dofs maybe)?

Many thanks in advance Georg