Dear Doug Greve,
Many thanks for your reply, however when I overlay group1.mgh and
group2.mgh on my average subject, they look pretty similar.
So I read it in matlab, using load_mgh(group*.mgh), which gave me
files having exactly the same structure as beta.mgh (size of 23406 x
1 x 7 x 6). The content of the 3 files (beta.mgh, group1.mgh and
group2.mgh) is also exactly identical.
So if I understood well, information is coded as 7 times 23406
vertices (which in total makes the 163842 vertices corresponding to
my average surface), and for each vertex I have 6 values.
I have thus two questions on beta.mgh:
1) The first two values look like thickness measurements, and thus
may be the average thickness for group 1 and group 2, is it right?
2) Can I also ask you what are the 4 other values?
Thank you very much for your help,
Marie Schaer
On Feb 9, 2007, at 7:22 PM, Doug Greve wrote:
If you are going to run mri_glmfit on the thicknesses in order to
do stats, then this should/could be one of the outputs. If you make
two groups in the fsgd file, then the first frame of the beta.mgh
file will be the average thickness for group1, and the 2nd frame
will be group 2.
use something like:
mri_convert beta.mgh group1.mgh --frame 0
mri_convert beta.mgh group2.mgh --frame 1
doug
Marie Schaer wrote:
Hello,
I have a two groups comparison design, and I was wondering if
there is any easy way to compute an average thickness file per
group (in order to be able to overlay mean thickness values on my
average subject). Is there an existing command or matlab function
to do it? If yes, would I also be able to do a standard deviation
file using the same command?
Many thanks,
Marie Schaer
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