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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gang
March 19, 2013 03:55PM
The issue of unpooled vs. pooled in 3dttest++ is about the assumption of whether the two groups have roughly the same variability. It's hard to tell beforehand which is more appropriate. If this is of concern to you, try out both options, and see if significance difference exists.

Alternatively you can use 3dMEMA with option -unequal_variance to explore the difference in within-group variability.

Gang
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pooled or unpooled

pshuk March 19, 2013 11:54AM

Re: pooled or unpooled

gang March 19, 2013 03:55PM