This is actually something that you cannot currently do in QDEC. Try doing a search for "paired" on our wiki for instructions on how to do this type of analysis. doug
Joana Braga Pereira wrote: > Dear Freesurfers, > > I'm doing a longitudinal analysis of cortical thickness using the > newest version of Freesurfer and there is something i would like to > ask you all. > > I have two time points and only one group of patients. > > I've finished the pre-processing and am now searching for differences > between the two time points using Qdec. > > Since i only have one group my cross.qdec.table.dat file looks pretty > much like this: > > fsid years > template_M_b01 0.665 > template_M_b02 0.665 > template_b03 0.71 > template_b04 0.79 > template_b05 0.915 > template_b07 0.665 > template_b09 0.625 > template_b10 0.625 > template_b11 0.71 > template_b13 1.04 > template_b14 0.71 > template_b15 0.665 > template_b16 0.835 > template_b17 0.665 > template_b18 0.625 > template_M_b19 0.71 > template_M_b20 0.625 > template_b21 0.71 > template_b22 0.585 > > I selected the long.thickness.rate in Qdec interface and years as > continuous covariate since it is the only variable that i have in > my cross.qdec.table.dat (no groups or other covariates of interest). > > My question is: Is this the analysis i should be doing given that i > want to know the differences between time point 1 - time point 2? > > Many thanks, > > Joana > ------------------------------------------------------------------------ > > _______________________________________________ > 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: www.nmr.mgh.harvard.edu/facility/filedrop/index.html _______________________________________________ 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.
