Re: [Freesurfer] Curvilinear interaction with age

-- Daniel Yang, Ph.D. Yale Child Study Center E-mail: daniel.yj.yang@yale.edu On 11/6/15, 9:23 PM, "freesurfer-bounces@nmr.mgh.harvard.edu on behalf of Martin Reuter" <freesurfer-bounces@nmr.mgh.harvard.edu on behalf of mreuter@nmr.mgh.harvard.edu> wrote: >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 : >https://urldefense.proofpoint.com/v2/url?u=http-3A__reuter.mit.edu&d=AwI... >g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=vhD8z919MORXy6GkKdTAw3V58rxzUZGOKpGXPDgqUHY&m >=cb9CorGJuJmEK4aPCmFuaMdl2fQb1F9u09ewaw0BJp8&s=ab1OEzviyC2H214Ar7pPsOizune >Nf70N_HSA6GFF4gs&e= > >_______________________________________________ >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 >https://urldefense.proofpoint.com/v2/url?u=http-3A__www.partners.org_compl >ianceline&d=AwIBAg&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=vhD8z919MORXy6GkKdTAw3V58rxz >UZGOKpGXPDgqUHY&m=cb9CorGJuJmEK4aPCmFuaMdl2fQb1F9u09ewaw0BJp8&s=9RthKtMjgu >qEGVWRB4PMDWnDdltdzCG2x7QjEwnI4iU&e= . 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. >