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Dear AFNI users-
We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:
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
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
| May 21, 2013 04:00PM | |
Jessica-
To your original question, my quick test suggests that the implementation of 3dRegAna should give you almost identical results for Coef #3 and the F-stat, with the exception that the t-stat sub-brik will give you directionality, whereas the F-stat will display all differences as positive. I believe that 3dRegAna F-test evaluates if the Full Model is significantly different from the Restricted Model. In which case, the F-stat should be the squared value of the t-stat for a single variable that differs between the two models. As shown in the figure below, forgive the rounding.
I'm not entirely sure the best way to do your analysis in 3dttest++ or 3dMEMA, but I'm hoping that Gang can help translate your original code to 3dMEMA or 3dttest++. I tend to only use 3dttest++ and 3dMEMA for single covariates.
Edited 1 time(s). Last edit at 05/21/2013 04:02PM by Peter Molfese.
To your original question, my quick test suggests that the implementation of 3dRegAna should give you almost identical results for Coef #3 and the F-stat, with the exception that the t-stat sub-brik will give you directionality, whereas the F-stat will display all differences as positive. I believe that 3dRegAna F-test evaluates if the Full Model is significantly different from the Restricted Model. In which case, the F-stat should be the squared value of the t-stat for a single variable that differs between the two models. As shown in the figure below, forgive the rounding.
I'm not entirely sure the best way to do your analysis in 3dttest++ or 3dMEMA, but I'm hoping that Gang can help translate your original code to 3dMEMA or 3dttest++. I tend to only use 3dttest++ and 3dMEMA for single covariates.
Edited 1 time(s). Last edit at 05/21/2013 04:02PM by Peter Molfese.
| Subject | Author | Posted |
|---|---|---|
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Anonymous User | May 21, 2013 11:28AM |
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gang | May 21, 2013 11:50AM |
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Anonymous User | May 21, 2013 01:11PM |
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gang | May 21, 2013 01:46PM |
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Peter Molfese | May 21, 2013 04:00PM |
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Anonymous User | May 24, 2013 01:33AM |
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gang | May 24, 2013 11:33AM |
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katya.dobryak | May 24, 2013 12:19PM |
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gang | May 24, 2013 02:04PM |
