Hi Daniel, you can always specify your own design matrix X in mri_glmfit. So just create those columns, fit and test. Of course you need to make sure that the order of subjects in Y is identical with the one used in X.
Cheers, Martin On 11/06/2015 06:14 PM, Yang, Daniel wrote: > Dear FreeSurfer experts, > > I have a group variable (X) with two levels and I want to test if there is a > curvilinear interaction with age (Z). Can this be tested in FreeSurfer? > > Specifically, the model would be > > Y = b0 + b1X + b2Z + b3Z*Z + b4X*Z + b5X*Z*Z + error > > I want to test b5 while controlling for b0-b4. > > Many thanks! > Daniel > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > -- Martin Reuter, PhD Assistant Professor of Radiology, Harvard Medical School Assistant Professor of Neurology, Harvard Medical School A.A.Martinos Center for Biomedical Imaging Massachusetts General Hospital Research Affiliate, CSAIL, MIT Phone: +1-617-724-5652 Web : http://reuter.mit.edu _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
