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  

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March 21, 2006 09:10AM
Correlation can be and is defined in several similar but not identical ways. In this case, the default algorithm of 3ddot is to compute the correlation coefficient without subtracting the means first; the '-demean' option subtracts the mean.

The program is quite short -- see the source code if you are confused about what it is actually calculating.
Subject Author Posted

3ddot: -demean??

giuseppe pagnoni March 20, 2006 06:27PM

Re: 3ddot: -demean??

Zhark March 21, 2006 09:10AM

Re: 3ddot: -demean??

giuseppe pagnoni March 21, 2006 11:39AM

Re: 3ddot: -demean??

Lee Friedman January 22, 2007 08:26AM

Re: 3ddot: -demean??

Zhark the Correlator January 22, 2007 09:08AM

Re: 3ddot: -demean??

Lee Friedman January 23, 2007 10:03AM

Re: 3ddot: -demean??

Giuseppe Pagnoni March 15, 2007 10:16PM

Re: 3ddot: -demean??

ryan August 11, 2015 05:02PM

Re: 3ddot: -demean??

gang August 12, 2015 06:15PM