I'm trying to set ut a freesurfer group analysis. In my fsgd file there are four groups/classes and 2 variables, like so:
GroupDescriptorFile 1 Title Class Class1 Class Class2 Class Class3 Class Class4 SomeTag Variables Variable1 Variable2 Input subj1 Class1 49 1 Input subj2 Class2 50 2 Input subj3 Class3 51 3 Input subj3 Class4 52 4 Input... I'm a bit puzzled as to how I should set up the contrasts. With DODS, there should be a matrix of 12 regressors, and I want to model how thickness varies with Variable2, ignoring the effects of Variable1 and Class. Should my contrast be 0 0 0 0 0 0 0 0 0.25 0.25 0.25 0.25 or 0 0 0 0 0 0 0 0 1 1 1 1 or something completely different? I have tried both contrasts, and they yield identical (and plausible) results. Kind Regards, Per Selnes _______________________________________________ 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.
