On Fri, Apr 13, 2018 at 10:21 AM, Susanna Carmona Cañabate < susannacarm...@gmail.com> wrote: > Dear Freesurfers, > > We are running a longitudinal study with 4 time points. The first two time > points were processed and edited with the 5.3 version of Freesurfer and the > other two time points with FS6. I assume we have to re-run the first two > time points with the new versión, but is there a way to preserve the > editings? > I think there is - this has been asked quite a lot of times. > > In the same line, on a transversal study, would it be a lot of bias if > most of the subjects of one group are processed with version 5.3 and most > of the subjects of the other group with FS6? > > As you know, Doug and Bruce will say that it's a bad idea to mix versions - period. As you know, it's a worse idea to differentially mix versions in 2 groups. Having said that, why not test it by comparing the explained variance of version for your measure of interest (e.g. thickness) and compare it with a variable that distinguishes the groups (e.g. diagnosis)? May be you already did this. I recently did something similar for Laura Pina (attached). Lots of kisses and let me know if you or your student need any help! -joost > Thanks a lot for your time > > _______________________________________________ > 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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_______________________________________________ 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.