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
August 07, 2015 11:45AM
If I understand you accurately, you have a model like the following

Connectivity with seed B = a0 + b1 * A + b2 * C + b3 * A * C + b4 * movement + b5 * age + b6 * gender + e

> To accomplish this end, could you please confirm that 3dttest++ should be run with each subject's z-scored
> whole-brain connectivity map with seed region B as inputs and Variable A and Variable C entered as covariates?

Yes 3dttest++ can take care of the analysis. If you are not interested in the parameter a0 in the model. You don't need to worry about centering.

> If so, could you please clarify how to interpret the output?
> To get the main effects of each behavioral factor (A & C) independently, would a separate 3dttest++ need to
> be run without the other variable (A or C)?

No, you don't need to run separate analyses. One analysis should give everything you want. The main effects of A and C are just b1 and b2 in the model.

Gang
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Subject Author Posted

Resting-state Mediation

S August 06, 2015 02:10PM

Re: Resting-state Mediation

gang August 07, 2015 11:45AM