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
|
Robert Cox
January 04, 2005 08:52AM
There are two common ways to compute the baseline for the purpose of being the denominator for the percent change calculation:

(1) Average of the entire data time series.
(2) Average of the 'non-stimulus' time points values.

To me, (2) make more sense. If you are using 3dDeconvolve, this is equivalent to the value that will be computed as the coefficient of the 1(t) baseline model function, since all the other baseline model functions have their mean removed before being inserted into the design matrix.

If you are using the AFNI 'FIM' functions or programs, then they use choice (1) by default.

ZtMM

Reply Quote
RSS
Subject Author Posted

baseline & average

sailor December 30, 2004 02:32AM

Re: baseline & average

Zorkon the Magnifimoose December 30, 2004 08:56AM

Re: baseline & average

sailor January 04, 2005 01:18AM

Re: baseline & average

Robert Cox January 04, 2005 08:52AM

Re: baseline & average

sailor January 04, 2005 10:58PM

Re: baseline & average

Robert Cox January 05, 2005 08:57AM

Re: baseline & average

Giuseppe Pagnoni January 05, 2005 09:21AM

Re: baseline & average

Robert Cox January 05, 2005 10:20AM

Re: baseline & average

giuseppe pagnoni January 06, 2005 02:32PM

Re: baseline & average

rick reynolds January 04, 2005 09:48AM