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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Mike Bello
February 09, 2005 12:00PM
You are right, Gang. I was looking at the ANOVA with a fifth condition. The one with 4 conditions has 48 degrees of freedom for the t tests, as you say. I tried running the paired t tests, and the results are very similar (same regions show up), just the significance levels are not as good, obviously. Thanks for your input.
-MikeGang Chen wrote:

> Mike,
>
> For the ANOVA, did you run your analysis with 3dANOVA or
> 3dANOVA2? Sounds like you were using the former, but 3dANOVA2
> would be more appropriate, in which case the t tests of
> those contrasts should have 48 degrees of freedom, not 64.
>
> You could also run 3dttest with its -paired option to get those
> contrast tests of interest. The difference with those of
> 3dANOVA2 should be small unless there are some irregularities
> in some of the conditions.
>
> Gang
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Subject Author Posted

contrast and dfs

Mike Bello February 09, 2005 11:17AM

Re: contrast and dfs

Robert Cox February 09, 2005 11:36AM

Re: contrast and dfs

Mike Bello February 09, 2005 11:48AM

Re: contrast and dfs

Gang Chen February 09, 2005 11:54AM

Re: contrast and dfs

Mike Bello February 09, 2005 12:00PM

Re: contrast and dfs

Gang Chen February 09, 2005 01:16PM