From greve@nmr.mgh.harvard.edu Fri Jan 7 09:53:34 2011 From: Douglas N Greve To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] variance or stdev from average Date: Fri, 07 Jan 2011 09:53:29 -0500 Message-ID: <4D2728E9.6090400@nmr.mgh.harvard.edu> In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0583143721417940023==" --===============0583143721417940023== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Try using mris_preproc with "--meas curv". Create a list of your=20 subjects in a text file which you then pass with the --f flag. The=20 output will be all the curvs from your subjects stacked together. You=20 can then use mri_concat with the --mean option to get the mean, or the=20 --std to get the standard dev. doug Bruce Fischl wrote: > Hi Thomas, > > you can specify -s to generate means and variances, but I'm=20 > pretty sure Doug has something more up-to-date to do this. > > cheers > Bruce > On Thu, 6 Jan=20 > 2011, Thesen, Thomas wrote: > > =20 >> Hi, >> >> I am using mris_average_curvature to create an average thickness map acros= s subjects (registered to fsaverage). >> >> The command line I am running is: >> >> mris_average_curvature lh.thickness lh sphere.reg subj01 subj02 .... subj= 20 outputfile >> >> This produces the average, but my question is if there a way to also creat= e a measure of variability at the vertex level from that group, e.g. the asso= ciated variance or standard deviation? >> >> Thanks, >> Thomas >> >> >> >> >> ------------------------------------------------------------
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Douglas N. Greve, Ph.D.
MGH-NMR Center
greve(a)nmr.mgh.harvard.edu
Phone Number: 617-724-2358=20
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
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