The problem is that it is not 30, it's 53. The FWHM is computed from the residuals. I don't know what your underlying data is, but it is very smooth. You can try not smoothing at all and see if it gets down to 30. You're probably better off using permutation  as it is more accurate.

On 5/21/19 10:43 AM, Amrita Bedi wrote:

External Email - Use Caution

Hi Dr Greve,

Is it not possible to use Monte Carlo for 30 FWHM?

Best, Amrita

On Tuesday, May 21, 2019, Greve, Douglas N.,Ph.D. <DGREVE@mgh.harvard.edu mailto:DGREVE@mgh.harvard.edu> wrote:

You have applied a lot of smoothing, and the tables don't go up
that high. Usually people will apply 5-10mm of smoothing. If you
really want that much smoothing, you should use permutation. See
https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/MultipleComparisonsV6.0Perm
<https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/MultipleComparisonsV6.0Perm>

On 5/21/2019 10:09 AM, Amrita Bedi wrote:

...

        External Email - Use Caution



---------- Forwarded message ----------
From: *abedi000@citymail.cuny.edu
<mailto:abedi000@citymail.cuny.edu>* <abedi000@citymail.cuny.edu
<mailto:abedi000@citymail.cuny.edu>>
Date: Tuesday, May 21, 2019
Subject:
To: "amibedi273@gmail.com <mailto:amibedi273@gmail.com>"
<amibedi273@gmail.com <mailto:amibedi273@gmail.com>>


Hi Freesurfer developers,

While running the mri glmfit sim command for a smoothing of 30
FWHM, I got the following error-

Original mri_glmfit command line:
cmdline mri_glmfit.bin --y lh.BINGE15.g2v1.30B.mgh --fsgd
BINGE15.g2v1.txt dods --C BINGE.g2v1.group-x-LDH_age.mtx --surf
fsaverage lh --cortex --glmdir
lh.BINGE15_g2v1.group-x-LDH_age.30B.glmdir

DoSim = 0
UseCache = 1
DoPoll = 0
DoPBSubmit = 0
DoBackground = 0
DiagCluster = 0
gd2mtx = dods
fwhm = 53.156463
ERROR: cannot find
/usr/local/freesurfer/average/mult-comp-cor/fsaverage/lh/cortex/fwhm53/abs/th13/mc-z.csd


I researched on the Freesurfer wiki page and found Dr Greve
answered a similar question saying-"When running mri_glmfit-sim,
add --cache-dir /path/to/mult-comp-cor" but I dont understand.
What is this path?

Thank You!

Best,
Amrita



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