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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giono
April 16, 2019 04:01AM
Thanks for this.

> How are you modeling the random effects? With a random intercept or both random intercept and slope?

I have started with both random intercept and slope, but then I have tried also with each on its own (only slope, only intercept) and the one with only intercept seems to be a bit different (less activation in all clusters) from the other two which do not differ. How do I peek the 'right' one? Should be my decision theory-driven? Or, for instance, can I extract the betas from a significant cluster and run a LME in SPSS to predict the best model and generalize that approach to all voxels?

> Does the average covariate value differ much between the two levels of the within-subject factor?

Not really, I have run a t-test and they don't differ (p=0.4).
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3dLME

giono April 15, 2019 08:00AM

Re: 3dLME

gang April 15, 2019 06:04PM

Re: 3dLME

giono April 16, 2019 04:01AM

Re: 3dLME

gang April 16, 2019 10:30PM

Re: 3dLME

giono April 17, 2019 08:32AM

Re: 3dLME

gang April 17, 2019 11:32AM

Re: 3dLME

giono April 18, 2019 07:18AM

Re: 3dLME

gang April 18, 2019 12:21PM

Re: 3dLME

giono April 19, 2019 04:58AM

Re: 3dLME

gang April 19, 2019 06:02PM