Aaron,
My opinion is that you are right, but maybe the folding index should be taken into account.
When we reach a conclusion about this I think is a good question to put in the faq.
best regards,
Pedro Paulo on E61
-- mens. original -- Assunto: [Freesurfer] statistics in aparc.stats De: "Goldman, Aaron (NIH/NIMH) [C]" aarong@mail.nih.gov Data: 28/02/2008 22:23
Hi, I just had a question regarding the statistics in ?h.aparc.stats. I'm interested in calculating average thicknesses for several labels combined, and wanted to verify how to do that correctly. The way the stat files are calculated, would it be valid to simply take an average of the listed average thicknesses, weighted by the listed surface areas?
Thanks,
-Aaron-
_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
I guess part of what I was wondering is, are the average thicknesses in the file weighted by area?
Thanks,
-Aaron-
-----Original Message----- From: Pedro Paulo Oliveira Jr [mailto:ppj@netfilter.com.br] Sent: Thursday, February 28, 2008 5:31 PM To: Goldman, Aaron (NIH/NIMH) [C] Cc: freesurfer@nmr.mgh.harvard.edu Subject: RE: [Freesurfer] statistics in aparc.stats
Aaron,
My opinion is that you are right, but maybe the folding index should be taken into account.
When we reach a conclusion about this I think is a good question to put in the faq.
best regards,
Pedro Paulo on E61
-- mens. original -- Assunto: [Freesurfer] statistics in aparc.stats De: "Goldman, Aaron (NIH/NIMH) [C]" aarong@mail.nih.gov Data: 28/02/2008 22:23
Hi, I just had a question regarding the statistics in ?h.aparc.stats. I'm interested in calculating average thicknesses for several labels combined, and wanted to verify how to do that correctly. The way the stat files are calculated, would it be valid to simply take an average of the listed average thicknesses, weighted by the listed surface areas?
Thanks,
-Aaron-
_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
no, they are the average all over all (equally weighted) vertices, but the vertex areas are pretty constant. On Fri, 29 Feb 2008, Goldman, Aaron (NIH/NIMH) [C] wrote:
I guess part of what I was wondering is, are the average thicknesses in the file weighted by area?
Thanks,
-Aaron-
-----Original Message----- From: Pedro Paulo Oliveira Jr [mailto:ppj@netfilter.com.br] Sent: Thursday, February 28, 2008 5:31 PM To: Goldman, Aaron (NIH/NIMH) [C] Cc: freesurfer@nmr.mgh.harvard.edu Subject: RE: [Freesurfer] statistics in aparc.stats
Aaron,
My opinion is that you are right, but maybe the folding index should be taken into account.
When we reach a conclusion about this I think is a good question to put in the faq.
best regards,
Pedro Paulo on E61
-- mens. original -- Assunto: [Freesurfer] statistics in aparc.stats De: "Goldman, Aaron (NIH/NIMH) [C]" aarong@mail.nih.gov Data: 28/02/2008 22:23
Hi, I just had a question regarding the statistics in ?h.aparc.stats. I'm interested in calculating average thicknesses for several labels combined, and wanted to verify how to do that correctly. The way the stat files are calculated, would it be valid to simply take an average of the listed average thicknesses, weighted by the listed surface areas?
Thanks,
-Aaron-
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
freesurfer@nmr.mgh.harvard.edu
-
Bruce Fischl -
Goldman, Aaron (NIH/NIMH) [C] -
Pedro Paulo Oliveira Jr