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
May 20, 2015 05:49PM
Sorry to hear that your relationship with 3dMVM has been strained recently!

> What is the difference between using -wsE2 and -wsMVT?

Reading the help information now, I realize that the description does need more clarifications. For each effect that involves a within-subject factor, there are two ways to test the effect:

1) conventional univariate approach (UVT)
2) within-subject multivariate approach (wsMVT)

By default, 3dMVM outputs the univariate testing (UVT) results. Option -wsMVT gives an additional (and separate) output (wsMVT). On the other hand, option -wsE2 merges the two (UVT and wsMVT) in the output. So you may add either of them, but probably not both.

Most of the time UVT is more powerful (e.g., higher F-values) than wsMVT, but there are exceptions. You can see this by comparing UVT with wsMVT, or comparing UVT with wsE2.

Hope the above clarifications will help you reinstall your relationship with 3dMVM.

Gang



Edited 2 time(s). Last edit at 05/20/2015 05:54PM by Gang.
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Subject Author Posted

3dMVM -wsE2 versus -wsMVT

Andrew Salzwedel May 19, 2015 03:47PM

Re: 3dMVM -wsE2 versus -wsMVT

gang May 20, 2015 05:49PM