If you are using the Different Offset Different Slope (DODS) model, then, by default, it tests at age=0. If you want to test at age=8, just subtract 8 from all the ages
On 09/26/2017 01:57 PM, Eryilmaz, H. Hamdi wrote: > Dear all, > > We are modeling changes in cortical thickness over time using a > cross-sectional design. We have two groups of participants, age 8 to > 18. In the cortical regions that interest us, there is generally a > linear decline in thickness with age. Each group can be fitted to a > best-fit line. The question we are interested in is whether there is > a significant difference in thickness between groups *at a given age > *(i.e., not just collapsed across age) — specifically, at the earliest > age point (age=8). Is this possible to model across the brain surface > in Freesurfer? > > Thanks, > Hamdi and Josh > > > > > > _______________________________________________ > 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 gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ 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.
