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

History of AFNI updates  

Previous Message Next Message
Message List New Topic Print View
|
Emperor Zhark
December 31, 2015 09:37AM
Looking back at the change history, there was a change made on 13 Oct 2011 that affected the way the covariate matrix squared inverse was calculated. The diagonal elements of this matrix appear in the denominator of the t statistic, and so under some circumstances this could change the t-statistic -- but it would not affect the numerator, which is the 'overlay' value to which you allude.

I believe the later version is correct, which is why the change was made. My actual memory of this change is very faded now, so I can't say what event prompted it.
Reply Quote
RSS
Subject Author Posted

3dttest++ version differences

Aleksandra Domagalik December 30, 2015 10:28AM

Re: 3dttest++ version differences

Emperor Zhark December 31, 2015 09:37AM

Re: 3dttest++ version differences

Aleksandra Domagalik January 04, 2016 12:38PM