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 05, 2013 06:56PM
> There was a lot of significant activation outside of the brain

This is irrelevant.

> the results were completely different than we expected from previous comparison tests
> of the groups we are examining. Here is the script used in the 3dRegAna

A couple of potential problems:

1) Do the two genders have roughly the same average value for each of the three quantitative variables (AgeMD, STAI, and BMI)? If it's not the case, things could be complicated.

2) Are the three quantitative variables centered properly? It's not surprising that the result looks strange to you because STAI is not centered, which means that the gender difference is provided at STAI = 0 in the output.

3) You're assuming that the two genders have the same effect for all the three quantitative variables, which may or may not true.

Gang
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Weird 3dRegAna Results

Aaron August 05, 2013 04:41PM

Re: Weird 3dRegAna Results

gang August 05, 2013 06:56PM