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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:
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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Hi Daniel,
Thank you so much for getting back to me. I am still not convinced that these z-scores of 13 are not some kind of error. Particularly because the t-values for these voxels produced by 3dttest++ do not seem to be extreme (or not more extreme then the t-values for neighboring voxels). For example, voxel A has a t-score of 10.65 and a z-score of 13. It's neighbor, voxel B, has a t
by
rbernhard
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AFNI Message Board
Daniel,
After your low probability hint I did some trouble shooting to root out the source of the error and I am honestly stumped. Hoping you guys can help me figure it out.
Again, just to repeat the problem, for my group-level analyses, I am running ttests using 3dttest++ with the -Clustsim flag for correcting for multiple comparisons. For a subset of my results, I am getting voxels with a
by
rbernhard
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AFNI Message Board
I take your reference to the Gaussian probability as a subtle hint that I likely have an error. :)
Thank you for your help!
by
rbernhard
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AFNI Message Board
Hi AFNI!
I have computed z-scores using 3dttest++ with the -Clustsim flag to correct for multiple comparisons. Everything seemed to be going well until I discovered that for a few of my analyses, I am getting clusters with a peak z-score of 13. For clusters where I get these peaks of 13, when I click around in the cluster, off the peak, I get more regular seeming z-scores (e.g. not whole number
by
rbernhard
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AFNI Message Board
Hi Rick, Thanks for responding so quickly! The data is from humans and was collected on a 3T scanner. Moreover, I have analyzed this exact dataset before using 3dttest++ and -Clustsim. The only difference is that with the original analyses I warped the data to TLRC using AFNI but this time I warped it with ANTS. So I assume it is some issue caused by the ANTS warping. I noticed that the grid spac
by
rbernhard
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AFNI Message Board
Hello AFNI-
I have exprienced a strange failure with -Clustsim in 3dttest++. The actual ttest seems to be working well, just the clustsim is failing. I saw it mentioned once here but the previous thread didn't seem to come to a resolution. I am hopeful that I can just run 3dClustSim on the output I have from the ttest instead of rerunning the entire test, but I am not totally sure which o
by
rbernhard
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AFNI Message Board
Hello! I think I have read all of the threads on this topic but am still stumped as to what exactly is going on and how to resolve it. Generally it seems like when people have posted about this issue the solution has been to update the OS, update AFNI, or update the version of align_epi_anat.py. But I don't think those solutions would apply in this case.
Here is how I am calling aligh_ep
by
rbernhard
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AFNI Message Board