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 17, 2012 09:15PM
Hi Paula,

Just to offer a slightly different take on Daniel's commands,
note that 3dTstat has a -tdiff option, which is to take the first
differences. So to get the sum of squared differences:

3dTstat -tdiff -sos -prefix sos INPUT+orig

Then use 3dcalc to divide by NT - 1:

@ ntm1 = `3dinfo -nt INPUT+orig` - 1
3dcalc -a sos+orig -expr a/$ntm1 -prefix mean.sos.diffs

- rick
Subject Author Posted

3dTstat on time-dependent variability measure?

paula December 17, 2012 04:02PM

Re: 3dTstat on time-dependent variability measure?

Daniel Glen December 17, 2012 04:52PM

Re: 3dTstat on time-dependent variability measure?

rick reynolds December 17, 2012 09:15PM

Re: 3dTstat on time-dependent variability measure?

paula December 18, 2012 09:06PM

Re: 3dTstat on time-dependent variability measure?

John January 15, 2014 04:19PM