Running
that, the highest off-diagonal
value was about 0.095. Is that enough that it should be a problem? I
also tried
running mri_glmfit with a fsgd file, and it claimed it was “not
formatted
properly.” Other than the fact that I have two class variables, my file
looks identical to the example on the wiki, so I’m wondering if that
was
supposed to be encoded in some way other than how I did it. In that
file, my
lines look like:
Group
Descriptor File
Title Title
Tessellation
surface
Class NC
(other
classes…)
Variables Age
Input
Subject01 NC Male 42.35
(other
subjects)
Is this how
it’s supposed to be?
Thanks,
-Aaron-
It sounds like there's
something wrong with your
design matrix. Try loading it into matlab and looking X'*X. If there
are
significant off-diagonal values, then that means that those components
are too
correlated to estimate.
doug
Goldman, Aaron (NIH/NIMH) [C] wrote:
Thanks. I had one more question now that I'm to mri_glmfit. Based on an
error message I'm getting, it seems something about my design matrix
isn't set up right. I'm inputting a text file for x in which each row
looks like:
1 0 0 1 0 42.35
with the first three numbers being my class variable of interest, the
next two gender, and the last age. It tells me the "matrix is
ill-conditioned or badly scaled, condno = 1e+08," and then prints out
the matrix and aborts. Do you know what I need to do differently for
this to work? Thanks,
-Aaron-
-----Original Message-----
From: Doug Greve [mailto:greve@nmr.mgh.harvard.edu]
Sent: Wednesday, February 14, 2007 11:49 AM
To: Goldman, Aaron (NIH/NIMH) [C]
Cc: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] smoothing question
something like:
mri_surf2surf --s subject --hemi lh --sval input --tval output --fwhm 5
doug
Goldman, Aaron (NIH/NIMH) [C] wrote:
Hi, I'm attempting to do thickness analysis based on the guide at:
http://surfer.nmr.mgh.harvard.edu/docs/ftp/pub/docs/fsgroupana.pdf
For the smoothing part using mri_surf2surf (page 14), I was wondering
what a typical command line should look like.
Thanks,
-Aaron-
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Douglas N. Greve, Ph.D.
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