19 Nov
2009
19 Nov
'09
2:16 p.m.
Yes, just specify the age^2 as a covariate (in addition to the the linear trend). Add age^3 as well. Note that you should demean each, and probably rescale so that the max of each is 1.
Dalwani, Manish wrote:
Hi All,
If you don't have a linear trend in the Cortical thickness vs age correlation, is there a way to use a polynomial (quadratic, cubic) regression model to best fit the cortical thickness vs age using the GLM mechanism of freesurfer?
Regards, Manish Dalwani Sr. PRA Univ. of CO
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
--
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422
Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html