Dear Doug, I am afraid that I don't see a difference between fsgd file and customized design matrix in this case. If I were to set up my own design, the matrix would still have a column of zero's -- unless there is a trick that I don't know?
Thank you very much for your patience. Sincerely, Ye On Sun, Sep 15, 2013 at 2:28 PM, Douglas Greve <gr...@nmr.mgh.harvard.edu>wrote: > > There is not a way to do this using an FSGD and a DODS model. It will work > if you change it to DOSS (if that is appropriate). Otherwise, you will need > to create your own design matrix and feed it to mri_glmfit with --X > doug > > > > On 9/13/13 10:21 PM, ye tian wrote: > > Dear Freesurfers, > > I am studying how the practice of meditation affects cortical thickness. I > have two types of meditations, and I also know for how many years each > mediator has meditated. Therefore, ideally I would like my categorical > factor to be meditation (control, meditation1 and meditation2), and > continuous factor to be the number of years of meditation. This design, of > course, has a problematic column of zeros, which corresponds to the slope > of the control (a non-meditator has meditated for 0 years). > > Does freesurfer has a way out of this problem? For example, I have came > across pseudoinverse methods in literature? > > Any suggestion is highly appreciated. > > Thank you very much! > Sincerely, > Ye > > > _______________________________________________ > Freesurfer mailing > listfreesur...@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > > _______________________________________________ > 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. > >
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