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
May 24, 2012 02:09PM
John,

It looks like you can center the covariate on the overall mean and then scale by the standard deviation. If you're not sure if the two groups have the same covariate effect, it's better not to make a stronge assumption, and go with

Model:-1+Time:Group+Group:MyCov

> would it be better to set up two 3dLME analyses, one looking at each hypothesis
> (one analysis omitting group membership and one analysis omitting the covariate),
> or to set up a single analysis to try to estimate the effects of group membership
> and covariate value at the same time?

One analysis with the covariate effects should be good enough to ask all your questions.

Gang
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Subject Author Posted

Comparing IRFs Between Groups

John Graner May 23, 2012 09:54AM

Re: Comparing IRFs Between Groups

gang May 23, 2012 02:19PM

Re: Comparing IRFs Between Groups

John Graner May 23, 2012 04:08PM

Re: Comparing IRFs Between Groups

gang May 23, 2012 04:53PM

Re: Comparing IRFs Between Groups

John May 24, 2012 10:37AM

Re: Comparing IRFs Between Groups

gang May 24, 2012 02:09PM

Re: Comparing IRFs Between Groups

John May 24, 2012 02:45PM