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 <mailto: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
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--
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
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