Dan, I am not sure what you are asking, but I have struggled with dyadic I. in its development of histograms because its direct usage is "biased" oppositely to the statistical histogram. At the following link I said, "I. collects frequency counts based on intervals which are open on the left and closed on the right: (xi-1,xi]. Statistical intervals reverse this pattern: [xi-1,xi). "
http://www.jsoftware.com/jwiki/BrianSchott/Histogram ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
