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
May 10, 2005 12:02PM
> I have a block design with 3 runs (condition A) and 3 levels
> in a run (condition B).

Do you mean that those 3 runs were analyzed separately?

> Now, I want to do an analysis across my 10 S's. It seems to
> me I need to get something like the IRF or some mean
> signal value to do this but then that would be different for
> every analysis. Where do I go next? I want to know if the B
> effect varies over A across S's.

I assume that you did deconvolve for individual subject analysis. For group analysis you can summerize each IRF with the sum (so-called area under the curve) or mean over the span of each IRF.

It looks like you need to run a 2-way within-subject ANOVA. And in AFNI subject is also counted as a factor, so you run 3-way ANOVA. You might have to use the Matlab package for this analysis:

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

Gang
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just needs some pointers on within S analysis

John Christie May 10, 2005 09:11AM

Re: just needs some pointers on within S analysis

Gang Chen May 10, 2005 12:02PM