Hello,

I am working with a dataset that has partial coverage. I am now ready for the group analysis, and although alignment and normalization worked pretty well, there is still some variability in how the epi maps overlap. I would like to use the -zskip option in 3dttest++ and I see I can put a decimal fraction after the option to indicate what percentage of voxels in each set must be nonzero. The example given in the help documentation is (.90), and I understand that too little overlap is a bad thing. However, is 90% overlap the consensus, or how should I determine what percentage is right for my data?

Thank you for your help,
Alfonso