Quote from Thunderdog:
With due respect, I'm not sure I agree with that characterization. Ignoring my views on market "probabilities" for the moment (as explained in my prior post to this thread) for the sake of argument, consider this example. A trader has historically had a win/loss ratio of only 40%. However, his average win is 4 times his average loss. Therefore, he hypothetically has a higher probability of losing money than making money on any given trade. Nevertheless, I would think that he has quite an edge if he can actually sustain his batting average over time (a big proviso). However, by the definition you quoted, he does not have an edge.