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
June 02, 2009 03:22PM
Thanks for the clarifications about stimulus intensity, Lisa. OK, your 3dRegAna script should be fine then. However the interpretation is a little tricky. Assuming you coded both Group and stimulus intensity with 0s (group A, stimulus intensity one) and 1s (group B, stimulus intensity two), AND, assuming you removed the mean from covariate age, then,

intercept (beta0) is the effect of groupA+stimulus intensity one at the average age;

1st beta is the effect of groupB+stimulus intensity one at the average age;

2nd beta is the effect of groupA+stimulus intensity two at the average age;

3rd beta is the common age effect between stimulus intensity one and two;

4th beta is the difference of age effect between stimulus intensity one and two.

HTH,
Gang
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Subject Author Posted

RegAna question

Lisa Eyler May 28, 2009 08:30PM

Re: RegAna question

Gang Chen May 29, 2009 10:14AM

Re: RegAna question

Lisa Eyler June 02, 2009 12:04PM

Re: RegAna question

Gang Chen June 02, 2009 03:22PM