If you run it with --help, you will see this. let me know if this is not
clear.
6. Select the threshold sign (--sim-sign). This is the sign of the
threshold used to create the clusters for cluster-wise correction
of multiple comparisons. Options are abs (unsigned), pos
(positive), and neg (negative). If you have an a priori hypothesis
(eg, group1 > group2), then choose positive. If you don not know
the sign, then use abs. Choosing a sign will yield stronger results
(ie, smaller p-values), but you will lose the other sign.
The FWHM is obtained from the data (glmdir/fwhm.dat)
doug
> mdkruepke@gmail.com <mailto:mdkruepke@gmail.com>
On 06/13/2012 02:04 PM, mdkruepke@uwalumni.com wrote:
> Freesurfers-
>
> When correcting for multiple comparisons using:
> mri_glmfit-sim \
> --glmdir lh.gender_age.glmdir \
> --sim mc-z 5 4 mc-z.negative \
> --sim-sign neg --cwpvalthresh 0.4\
> --overwrite
> What does the sign mean (ie - the neg, pos, abs). Also for the mc-z
> simulation type do we no longer need to include the smoothness of our
> data (FWMH)?
>
> Michael D. Kruepke
> PhD - University of Illinois at Urbana-Champaign
> BA - Psych - University of Wisconsin-Madison
> (262)-483-7449
>
>
>
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--
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve@nmr.mgh.harvard.edu
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Fax: 617-726-7422
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