15 Sep
2013
15 Sep
'13
9:45 p.m.
Just remove that column. You don't need it or want it. doug
On 9/15/13 11:42 PM, ye tian wrote:
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 <greve@nmr.mgh.harvard.edu mailto:greve@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 list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto: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.