5 Nov
2009
5 Nov
'09
9:10 a.m.
Hi,
I have a couple of questions regarding mri_glmfit-sim (mc-z).
1. Is it correct that --sim-sign abs builds up a null distribution of max cluster sizes regardless of the direction of the effects in the simulated data while --sim-sign pos/neg only counts the largest positive/negative cluster for every iteration? Or is the sign only used in the subsequent correction procedure by mri_surfcluster and not affecting the null distribution?
2. Under which circumstances would it be advisable to choose --sim-sign abs instead of pos/neg and vice versa?
Thanks a lot, Lars