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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Jatin
November 10, 2008 11:10AM
Hi Everyone,

I have a question on computing betas related to the following thread:
[afni.nimh.nih.gov]

I have an experiment with 4 runs. In the past, I have fed each run into 3dDeconvolve (see below) and get an overall beta for each experimental condition of interest which I then use in group analyses. However, I now understand that it is best to compute beta coefficients seperately for each run and then either average them or use RUN as a within subjects variable in an ANOVA analysis so as to be able to look at order/time effects. My question is: Is the overall beta the average of all four betas (for each of the 4 runs) or is based on what would effectively be 1 long run?

Much thanks as always for your help.

Jatin
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Subject Author Posted

Multiple run betas

Jatin November 10, 2008 11:10AM

Re: Multiple run betas

Jatin November 10, 2008 11:24AM