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
July 22, 2019 01:41PM
Gerome,

> If I am interested in the differences between conditions within each task then should The Y-value to used in RBA be (TAc1- TAc2) and (TBc1 - TBc2) ?
> Similarly, if I am interested in between task-comparisons for each condition should the Y-value used in the RBA be (TAc1 - TBc1) and (TAc2 - TBc2) ?

The answer to both questions is YES: you perform four separate analyses, one for each contrast.

> should each contrast be modeled separately at the group level, and if so - is there a need for a correction?

Even under the conventional AVOVA framework, there is no easy solution for controlling of FWE in this context. As long as all those four comparisons are planned analyses, I would not worry about it.

Gang
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Computing the Y Value for within-task comparisons using Region Based Analysis.

GMan July 22, 2019 01:17PM

Re: Computing the Y Value for within-task comparisons using Region Based Analysis.

gang July 22, 2019 01:41PM