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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December 09, 2016 08:47AM
Thanks Bob!
This information is invaluable.
The reason I asked is that
I just had a hunch from playing around with some synthetic gaussian spatial ACF images that the 3dFWHMx' s ACF 'a' parameter's upper limit is 0.9940 and hence the -acf option will overestimate the spatial correlation. I guess one should employ the "classic" method FWHM-estimate when the spatial ACF is gaussian.

Regards
Gopi
Subject Author Posted

Algorithm used to fit ACF in 3dFWHMx

Gopi December 08, 2016 05:27PM

Re: Algorithm used to fit ACF in 3dFWHMx

Bob Cox December 08, 2016 07:08PM

Re: Algorithm used to fit ACF in 3dFWHMx

Gopi December 09, 2016 08:47AM