Can you say more about how the 10mm, th 1.3 is different than the others?
On 3/11/2020 2:48 PM, Purcell, Juliann wrote:
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Hi FreeSurfer Experts,
I am running permutation simulations with several smoothing levels and
cluster forming thresholds to evaluate the best parameters for our
data, since there does not seem to be a consensus in the literature.
However, I’m getting an unexpected result at only one
smoothing/threshold level.
I have run permutations (mri_glmfit-sim) at 0mm, 5mm, 10mm using the
following thresholds: 1.3, 2.0, 2.3, and 3.0. Results of permutation
at 10mm + threshold 1.3 were not as expected and did not line up with
results at the other smoothing and threshold levels. I’ve re-checked
that the command is correctly referencing the data and I’ve compared
the th1.3 log file with the log files at the other thresholds. I could
not find any differences that would cause the output of the
permutation simulations to be so different between th1.3 and th2.0.
There are no errors or failures in the permutation log files. I’ve
searched the message board and didn’t see any posts that related to
this issue.
Although it’s possible that these are true results, I want to make
sure there isn’t a mistake on my end. Any help would be greatly
appreciated!
Below is information about my FreeSurfer version, platform, and the
log files from the permutation simulations:
1)FreeSurfer version:
freesurfer-Linux-centos6_x86_64-stable-pub-v6.0.0-2beb96c
2)Platform: Linux
3)uname -a: Linux c0135 3.10.0-1062.9.1.el7.x86_64 #1 SMP Mon Dec 2
08:31:54 EST 2019 x86_64 x86_64 x86_64 GNU/Linux
4)Perm sim log files: See attached logs for 10mm smoothing at
threshold 1.3 and threshold 2.0
Best,
Juliann Purcell, MSc
Doctoral Candidate
Medical/Clinical Psychology Doctoral Program
University of Alabama at Birmingham
Department of Psychology
julia...@uab.edu <mailto:julia...@uab.edu>
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