I was wondering if there is a numerical approach to prove that a system has some fundamental causes, bias... ? Can you sort systems in "edge systems" and "fitting systems" just out of the backtests result fields? I'm asking the question 'cause I do exactly the opposite. I consider the system as having an edge when the total process of creating the system comes out of an idea I have that some intermarket, macro, structural phenomenon is so strong that it must be some systems working on it. On the opposite, I've never found that a random system I 've coded was performing well because of an edge I hadn't thought of... There must be some but can you discover them in numbers? Any comments? Thanks.