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

History of AFNI updates  

Previous Message Next Message
Message List New Topic Print View
|
Gang Chen
November 03, 2004 11:18PM
Yes, as you listed, there are different ways to run such a group analysis.

One-way ANOVA (3dANOVA) is not appropriate in this case because the correlation between the two conditions across subjects is not modeled.

For the contrast of A-B, paired t test (3dttest) or one-sample t test on the contrast should be comparable to 3dAVOVA2 -type 3. However, the single effects of conditions A and B might be slightly different between the two methods because the assumptions under the two approaches are not the same. You can argue one way or the other, but I would simply run 3dAVOVA2 -type 3 since all the results come out with just this one shot.

See more discussion here: [afni.nimh.nih.gov]

Cheers,
Gang
Reply Quote
RSS
Subject Author Posted

group analysis & 3dANOVA

dongpsy November 03, 2004 07:45PM

Re: group analysis & 3dANOVA

Gang Chen November 03, 2004 11:18PM

Re: group analysis & 3dANOVA

wangxy November 07, 2004 11:49PM

Re: group analysis & 3dANOVA

wangxy November 08, 2004 12:59AM

Re: group analysis & 3dANOVA

dongpsy November 11, 2004 07:06AM