AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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Aditya Prasad
October 31, 2009 09:14PM

I've got a functional mask dataset which is nonzero at all places where some (interaction contrast) t-stat is sufficiently high and are overlapping the amygdala. I want to extract a single number representing the average value of some beta value across this mask for all subjects. This will be repeated for many betas, some of which are part of the interaction contrast, and some of which are not.

Anyway, I think this can be accomplished with a bunch of 3dmerge commands (one per subject to average across the mask, then one to average across all of those outputs), but this may not be the simplest way of doing it (especially the latter command, which is painful).

Is there a clean way, or is the analysis I described unusual?

Thanks!
Aditya
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Averaging across subjects and over clusters

Aditya Prasad October 31, 2009 09:14PM

Re: Averaging across subjects and over clusters

rick reynolds November 02, 2009 09:12AM