afni.nimh.nih.gov
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:
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
| June 21, 2018 11:00AM | |
Dear AFNI,
I calculated a correlation using 3dTcorr1d, then converted the r values to z values using 3dcalc. The statistical map themselves look correct: the voxels contain values that are reasonable z values. However the AFNI GUI thinks these are still r values insofar as the threshold slider has "corr" written at the top, and only gives me the options of thresholding between 0 and +/-1 (appropriate for r but not z values). This prevents me from properly visualizing significant results and (more importantly) from clusterizing with z thresholds above 1. How may I edit the BRIK file to either change its type to a z statistic, or remove any restriction altogether? Or, is there some other option I can use during 3dcalc of which I am not aware?
I did later see that I can convert r values z values with an extra command line option during 3dTcorr1d, but I still would prefer to know how to change this on my own moving forward, if possible. Thanks!
I calculated a correlation using 3dTcorr1d, then converted the r values to z values using 3dcalc. The statistical map themselves look correct: the voxels contain values that are reasonable z values. However the AFNI GUI thinks these are still r values insofar as the threshold slider has "corr" written at the top, and only gives me the options of thresholding between 0 and +/-1 (appropriate for r but not z values). This prevents me from properly visualizing significant results and (more importantly) from clusterizing with z thresholds above 1. How may I edit the BRIK file to either change its type to a z statistic, or remove any restriction altogether? Or, is there some other option I can use during 3dcalc of which I am not aware?
I did later see that I can convert r values z values with an extra command line option during 3dTcorr1d, but I still would prefer to know how to change this on my own moving forward, if possible. Thanks!
| Subject | Author | Posted |
|---|---|---|
|
Nathan Petro | June 21, 2018 11:00AM |
|
rick reynolds | June 21, 2018 02:10PM |
