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Dear AFNI users-

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Sincerely, AFNI HQ

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shanusmagnus
November 19, 2014 01:50PM
I'm trying to get different-than-default alpha values out of 3dClustSim. But no matter how I specify them via -athr, I keep getting the default ones. Here's some of the resultant NN1 .1D file: 
# 3dClustSim -athr .05 .01 .005 .001 .0005 .0001 .00001 -fwhmxyz 5.749 6.242 5.928 -mask anat_masks/new_temporal_group_mni.nii -niml -prefix test
# Grid: 73x87x73 2.50x2.50x2.50 mm^3 (27650 voxels in mask)
#
# CLUSTER SIZE THRESHOLD(pthr,alpha) in Voxels
# -NN 1  | alpha = Prob(Cluster >= given size)
#  pthr  | .10000 .09000 .08000 .07000 .06000 .05000 .04000 .03000 .02000 .01000
# ------ | ------ ------ ------ ------ ------ ------ ------ ------ ------ ------
 0.100000   409.4  419.2  429.0  445.2  461.0  480.7  502.7  528.4  559.3  626.3
 0.090000   337.0  343.4  352.2  361.8  374.6  388.7  408.2  430.0  459.0  512.0
 0.080000   278.3  284.6  291.9  300.5  309.3  320.8  334.9  357.8  383.2  429.0
 0.070000   225.4  230.4  236.6  244.7  252.5  261.6  273.0  287.1  311.0  346.9
 0.060000   183.1  187.4  192.1  197.8  202.6  210.6  220.7  232.0  249.1  278.5
 0.050000   145.1  148.2  152.3  157.3  162.5  168.6  174.4  184.3  198.2  223.0
 0.040000   114.2  116.9  120.1  123.9  127.8  132.9  139.5  145.9  156.4  171.6
 0.030000    87.0   88.9   91.1   93.6   96.6  100.3  104.8  110.4  119.8  133.0
As you can see, the alpha values that are computed don't change regardless of what you specify as -athr. Am I doing something wrong, or is this a bug? I'm using:

Precompiled binary linux_openmp_64: Sep 23 2014 (Version AFNI_2011_12_21_1014)
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Subject Author Posted

3dClustSim doesn't produce requested alpha values

shanusmagnus November 19, 2014 01:50PM

Re: 3dClustSim doesn't produce requested alpha values

rick reynolds November 19, 2014 02:25PM

Re: 3dClustSim doesn't produce requested alpha values

shanusmagnus November 19, 2014 02:38PM