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
March 20, 2008 05:42PM
> could you please explain the reason why when run the afni ANOVA
> we need same group sizes? Is it a mathematical/statistical reason?

Yes, both 3dANOVA2 and 3dANOVA3 use the traditional approach to assessing the contributions from various factors and their interactions, which unfortunately requires equal number of subjects across groups.

For experiments with unequal number of subjects across groups, use R program 3dLME:

http://afni.nimh.nih.gov/sscc/gangc/lme.html

or Matlab package GroupAna:

http://afni.nimh.nih.gov/sscc/gangc/Unbalanced.html/

Gang
Reply Quote
RSS
Subject Author Posted

equal sample size in Anova

Alessandra Passarotti March 20, 2008 04:34PM

Re: equal sample size in Anova

Gang Chen March 20, 2008 05:42PM

Re: equal sample size in Anova

Gang Chen March 20, 2008 08:56PM

Re: equal sample size in Anova

Alessandra Passarotti March 21, 2008 02:48PM