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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Laura
March 25, 2009 01:44PM
I have a Group (A, B unequal sample size) x Condition1 (C, D) x Condition2 (E, F) design in which Group is a between subject factor and Conditions 1 and 2 are within subject factors.

I have run the group analysis using GroupAna and have noticed that when I look at a within subject contrast Group A, Condition1: C > D the regions that show up are different than if I run 3dANOVA3 within Group A and look at the Condition1 C>D.

I assume this difference is due to differences in df when running the between group vs. within group analysis. Is this correct?

Which way is the more appropriate way to describe the within group differences?
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Comparing within subject contrast in GroupAna with results from 3dANOVA2

Laura March 25, 2009 01:44PM

Re: Comparing within subject contrast in GroupAna with results from 3dANOVA2

Gang Chen March 25, 2009 04:38PM