I’m trying to use Neuropower to perform a power analysis on pilot group-level analyses, but the tutorial is a little confusing. One of the inputs is the threshold used in the analysis, but the input images, including the one from the tutorial, look unthresholded to me. Should the input image be thresholded or the raw statistical map?
The threshold refers to the cluster forming threshold. Your map can be thresholded at this threshold (but certainly doesn’t have to be, raw tstats map will work). The map shouldn’t be significance thresholded. Hope this helps.