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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gang
August 22, 2022 05:15PM
> help file for 3dfim+ appears to say its old and not being maintained. Is 3dDeconvolve now the preferred approach these days?

Even though 3dfim+ will not be updated, it can still be used as long as you adopt the same or similar model formulations. In fact, you can directly obtain the output for correlation values from 3dfim+ without conversion like 3dDeconvolve.

> What is proper polort # and other basic parameters to use?

The order of polynomial fit is purely empirical. If I remember it correctly, a rule of thumb is one order per 150 seconds of data. For Beta Series analysis, probably easier to use the option -stim_times_IM.

> What is the proper Coef and R^2 subbriks outputs to use in the following square root step
> 'ispositive(b)*sqrt(a)-isnegative(b)*sqrt(a)' equation, the FULL_model, or the Stim_file_1_SEED?

The 'a' part is the regression coefficient and 'b' is R^2.

Gang
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Subject Author Posted

Beta-series Seed2WB correlation maps

daanderson August 20, 2022 03:52AM

Re: Beta-series Seed2WB correlation maps

gang August 22, 2022 05:15PM

Re: Beta-series Seed2WB correlation maps Attachments

daanderson August 23, 2022 05:29AM

Re: Beta-series Seed2WB correlation maps

gang August 24, 2022 01:50PM