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 23, 2002 08:00PM
Hi Folks,

There is an option for using unpooled variance estimates in 3dttest, but according to the documentation, this is not recommended (due to the voxel to voxel variability in DF that it introduces). Do you have any suggestions, then, about how to compare the magnitude of fit coefficients between two samples of individuals with significantly different variances (at least in some voxels)?

Thanks in advance,

Lisa
Subject Author Posted

Unpooled variance ttests

Lisa Eyler Zorrilla December 23, 2002 08:00PM

Re: Unpooled variance ttests

bob cox December 24, 2002 08:57AM

Re: Unpooled variance ttests

Lisa Eyler Zorrilla December 24, 2002 04:39PM

Re: Unpooled variance ttests - Addition to 3ddtest

bob cox December 27, 2002 12:04PM