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
August 10, 2004 07:05PM
1) How do I get manual for R0I stats?

Simply typing 3dROIstats -help should give you all the available options for the command.

2) We seem to be having a problem calculating percent signal change with our new version of AFNI (July's remake). The IRF calculations are the same, but are baseline determination (i.e. the denominator) based on the coefficients for the zero, first and second order terms provide totally different results, primarily because the first and second order coefficients seem to be totally different. Is there another way of calculating the baseline for % signal change?

Percent signal changes are usually calculated with 3dcalc. I don't really understand your problem with the baseline parameters, but, if you normalize (scale) the signal before you run 3dDeconvolve, you would not have to deal with baseline parameters, and things would be much tidier in the end.

Refer to HowTo5 for details on percent signal change:
[afni.nimh.nih.gov]

Gang
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Subject Author Posted

Average IRF for ROI

Phil Burton August 08, 2004 05:20PM

Re: Average IRF for ROI

rick reynolds August 08, 2004 07:45PM

Thanks!

Phil Burton August 08, 2004 08:41PM

manual for R0Istats, ?on %signal change

Morris Goldman August 10, 2004 06:29PM

Re: manual for R0Istats, ?on %signal change

bob cox August 10, 2004 07:03PM

Re: manual for R0Istats, ?on %signal change

Gang Chen August 10, 2004 07:05PM