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 Chen
December 12, 2005 03:32PM
> How can Alphasim be used to find cluster sizes for a group ANOVA?

I can't think of anything with AlphaSim that would be different from what is done with individual subject analysis.

> I've been reading some work and it seems that cluster sizes for
> ANOVA analyses are often higher than cluster sizes for single
> subject T-maps, which doesn't make entire sense to me. I am
> guessing it has to do with spatial correlation of the data?

I have never done such a comparison, but I agree with you that the difference in minimum cluster size is most likely due to different spatial correlation since spatial correlation of the residual error might be slightly different between the two analyses.

Gang
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Subject Author Posted

ANOVA and Alphasim

Donald McLaren December 09, 2005 11:06PM

Re: ANOVA and Alphasim

Gang Chen December 12, 2005 03:32PM