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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May 13, 2013 06:17PM
How about this: use 3dMean -sd on each group separately to obtain the within-group standard deviation. The ratio of the variances (standard deviation squared) between the two groups would roughly follow an F(n1-1, n2-1)-statistic distribution, which should give you some idea about the variance difference.

Gang



Edited 1 time(s). Last edit at 05/14/2013 10:27AM by Gang.
Subject Author Posted

Variance/ heteroscedasicity

Matt_McNeill May 13, 2013 01:28PM

Re: Variance/ heteroscedasicity

gang May 13, 2013 02:44PM

Re: Variance/ heteroscedasicity

Matt_McNeill May 13, 2013 04:10PM

Re: Variance/ heteroscedasicity

gang May 13, 2013 05:00PM

Re: Variance/ heteroscedasicity

Matt_McNeill May 13, 2013 05:38PM

Re: Variance/ heteroscedasicity

gang May 13, 2013 06:17PM

Re: Variance/ heteroscedasicity

Matt_McNeill May 13, 2013 08:13PM