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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Bob Cox
May 15, 2009 09:14AM
If you are passing correlation coefficients as inputs to 3dANOVA, then you are violating the assumptions of the analysis. In particular, CCs are not even approximately normally distributed, which could explain why your statistics are a little strangely distributed.

You could alleviate this problem by stretching the CCs to be more normal. The simplest way to do this, and the traditional one (going back to the Babylonians) is to take the arc-tanh of each CC. You can do this with 3dcalc, or in whatever program you are using to generate the CC datasets.

Subject Author Posted

2% of voxels reaching p < .05

cdm May 14, 2009 09:14AM

Re: 2% of voxels reaching p < .05

Gang Chen May 14, 2009 05:44PM

Re: 2% of voxels reaching p < .05

rick reynolds May 14, 2009 06:26PM

Re: 2% of voxels reaching p < .05

cdm May 19, 2009 09:04AM

Re: 2% of voxels reaching p < .05

rick reynolds May 19, 2009 10:12AM

Re: 2% of voxels reaching p < .05

cdm May 20, 2009 11:04AM

Re: 2% of voxels reaching p < .05

Bob Cox May 15, 2009 09:14AM

Re: 2% of voxels reaching p < .05

cdm May 15, 2009 09:32AM