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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Dan Rowe
November 26, 2003 02:25PM
I just want to make a note about using the average time courses in ROI's. I would advise against computing any sort of correlation matrix between ROI's that used these average time courses. The correlation between an ROI with a large number of voxels and all other ROI's will be artificially inflated due to the smaller standard deviation in the denominator.

I have found that a possible alternative is to bootstrap the mean time course. An equal number of samples is used to compute the variances.

Dan
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Subject Author Posted

group averages

Cathy November 25, 2003 09:53PM

Re: group averages

Jim Eliassen November 26, 2003 09:36AM

Re: group averages

Cathy November 26, 2003 12:56PM

Re: group averages and 3dmaskave

bob cox November 26, 2003 01:35PM

Re: group averages and 3dmaskave

Jim Eliassen November 26, 2003 02:14PM

Re: group averages and 3dmaskave

Dan Rowe November 26, 2003 02:25PM