So if these aren't useful for only 1 subject, what would be the best way to look at data over multiple scans for just the one subject?
On Mon, Jun 6, 2016 at 2:12 PM, Martin Reuter <mreu...@nmr.mgh.harvard.edu> wrote: > Hi Carolyn, > > not sure what you are asking. You want to do statistics on N=1 subject ? > > Anyway, in order to use QDEC, you'd have to reduce the longitudinal data > (thickness, measured at different time points) to a single number: the > slope of a linear fit. This is called the 2-stage-approach. > > Or you skip Qdec and do a Linear Mixed Effects model directly. > > Either approach only makes sense if you have a bunch of subjects (per > group). > > Best, Martin > > Ps info on longituidnal statistics: > https://surfer.nmr.mgh.harvard.edu/fswiki/LongitudinalStatistics > > On 06/06/2016 09:45 AM, Carolyn Drobak wrote: > > Hello, > > I have six scans for a single subject. I have performed "group analysis," > but wish to use longitudinal data analysis. In particular, I was able to > get a base for the subjects, so can view in freeview and all of that. My > issue arises when I try to use QDEC. Because QDEC can't use my > long.qdec.table.dat file, nor does it like my cross.qdec.table.dat file. > The problem seems to be that I only have one base, i.e. one subject. Is > there some way to run analysis on this so I can still get all the > statistics I want (mostly interested in cortical thickness) using just my > one subject? > > I'm still fairly new to FS, but have done the large majority of the > tutorials, so am pretty sure I'm not just messing up my files here. > > Thanks, > CMD > > On Mon, Jun 6, 2016 at 9:40 AM, Carolyn Drobak <carolyn.droba...@gmail.com > > wrote: > >> Hello, >> >> I have six scans for a single subject. I have performed "group analysis," >> but wish to use longitudinal data analysis. In particular, I was able to >> get a base for the subjects, so can view in freeview and all of that. My >> issue arises when I try to use QDEC. Because QDEC can't use my >> long.qdec.table.dat file, nor does it like my cross.qdec.table.dat file. >> The problem seems to be that I only have one base, i.e. one subject. Is >> there some way to run analysis on this so I can still get all the >> statistics I want (mostly interested in cortical thickness) using just my >> one subject? >> >> I'm still fairly new to FS, but have done the large majority of the >> tutorials, so am pretty sure I'm not just messing up my files here. >> >> Thanks, >> CD >> > > > > _______________________________________________ > Freesurfer mailing > listfreesur...@nmr.mgh.harvard.eduhttps://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > -- > Martin Reuter, PhD > Assistant Professor of Radiology, Harvard Medical School > Assistant Professor of Neurology, Harvard Medical School > A.A.Martinos Center for Biomedical Imaging > Massachusetts General Hospital > Research Affiliate, CSAIL, MIT > Phone: +1-617-724-5652 > Web : http://reuter.mit.edu > > > _______________________________________________ > 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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