Hi FS experts and
users,
May I ask some
questions about clusterwise correction for multiple comparisons?
1,In mri_glmfit-sim
command, there is a --sim(--sim nulltype nsim threshold csdbase) option. Choose
the voxel/vertex-wise threshhold used to define clusters. This will be
-log10(p), where p is the p-value. Eg, to use all
voxels/vertices
with p < .01, then set the threshhold = 2.I
want to know what is meaning of "using all voxels with p < 0.01". Does
it mean that considering all voxels whose p value below 0.01 in every
iterations. Then it generates some clusters in every iteration. Is it
right?
2,Also there is a
--sim-sign option in this command. I want to know meaning of the
sign: abs,pos,neg.Does it represent one- and two-tailed tests?
Thanks.
All the best.
Rujing Zha
2014-02-20
charujing123