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
October 11, 2021 05:21PM
Hi Will,

> In trying to prep data for an RSA analysis, your 3dLSS program is wonderfully efficient.

Efficient in what sense? Compared to 3dDeconvolve/3dREMLfit?

> 3dLSS does not have an option for outputting t-maps.

From the modeling perspective, 3dLSS is inferior to 3dDeconvolve/3dREMLfit. Essentially 3dLSS is a band-aid approach to fixing the potential numerical problem of high collinearity when the individual trials are too close to each other. If your experimental design is well-optimized, it would be much preferable to directly use 3dDeconvolve/3dREMLfit instead of 3dLSS. It is also because of the band-aid approach with 3dLSS that makes it difficult to provide statistical evidence (e.g., t-statistics).

Gang
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Subject Author Posted

3dLSS to output T-maps?

wgraves October 09, 2021 12:54PM

Re: 3dLSS to output T-maps?

gang October 11, 2021 05:21PM

Re: 3dLSS to output T-maps?

wgraves October 12, 2021 06:12PM

Re: 3dLSS to output T-maps?

gang October 13, 2021 01:02PM

Re: 3dLSS to output T-maps?

wgraves October 14, 2021 03:28PM