Hi Martin, When I convert my long qdec table to a cross sectional table to analyze for exemple percent change maps, I have some difficulties to identify my independent factor in this case, because I don't have two groups like in the longitudinal study (On-Off). Could you please help me to build this cross table from my long table?
Exemple of my longitudinal table: fsid fsid-base group preJMS_007 JMS_007 ON postJMS_007 JMS_007 OFF preRME_063 RME_063 ON postRME_063 RME_063 OFF ... Thank you very much, yolanda 2012/7/4 Yolanda Vives <yvi...@pic.es> > Hi Martin, > > Thank you for your answer. I am also interested in testing your new > scripts, if it is possible. > > Regards, > Yolanda > > 2012/7/3 Martin Reuter <mreu...@nmr.mgh.harvard.edu> > >> Hi Yolanda, >> >> take a look at the longitudinal tutorial: >> http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/LongitudinalTutorial >> >> There is a section that hints at the post-processing as far as we have >> implemented it. Based on a longitudinal qdec table you can run >> long_mris_slopes to create rate or percent change maps for each subject >> and then run qdec on these for the cross sectional comparison. >> >> Also I can make available a newer version of that script as lots of >> small things have changed since last year, let me know. >> >> Best, Martin >> >> >> On Tue, 2012-07-03 at 15:58 +0200, Yolanda Vives wrote: >> > Hi Martin, >> > >> > I would like to compare also a Control vs. an Experimental group >> > (pre-post), but instead of using ROIs, I am interested in a >> > whole-brain paired t-test analysis between the two groups. Which data >> > should I take? Would it be possible to process ?.long.base with qcache >> > and take the "rh.thickness.fwhm20.fsaverage.mgh" files? Or maybe could >> > I use QDEC with ?.long.base after qcache? >> > >> > Thank you, >> > Yolanda >> > >> > 2012/4/12 Martin Reuter <mreu...@nmr.mgh.harvard.edu> >> > Yes, just extract the stats on each time point as done in a >> > cross >> > sectional analysis (but instead on the ?.long.base >> > directories) do a >> > paired t (or a t on the difference) to see if there is >> > increase or >> > decrease. >> > >> > If you look at one of the reported ROI's (e.g. caudate volume, >> > or >> > pre-central thickness) you can directly get the values from >> > the stats >> > files. If you have your own ROI's you need to use segstats to >> > get the >> > stats for them. >> > >> > Cheers, Martin >> > >> > On Wed, 2012-04-11 at 19:19 +0200, Dídac Vidal wrote: >> > > Hi everybody, >> > > I have a question about FS longitudinal post-processing. >> > Currently I >> > > obtained some corrected results comparing a Control vs. an >> > > Experimental group (pre-post). >> > > What i would like to know is if there's a thinning in the >> > control >> > > group or a increase in the thickness of the experimental >> > group. >> > > I tought in create a label and extract the individual values >> > of both >> > > timepoints and then do a t test in order to see if the mean >> > differs to >> > > 0. >> > > How I can do that?; There is an easier way to do it? >> > > Thanks in advance >> > > >> > > -- >> > > Dídac Vidal Piñeiro >> > > >> > > Dept. Psychiatry and Clinical Psychobiology >> > > Faculty of Medicine >> > > University of barcelona >> > > >> > > >> > >> > > _______________________________________________ >> > > Freesurfer mailing list >> > > Freesurfer@nmr.mgh.harvard.edu >> > > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> > >> > _______________________________________________ >> > 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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