Stat arb? Technical indicators? News trading? Chart patterns? Risk arb? Momentum trading? Fast market making and spread extraction? I'm trying to get a feel for what the distribution is like out there for people who have profitable trading systems. I get the feeling most people in this forum are "curve fitters" -- applying their intuition of a market and finding technical indicators that fit their observations. I want to know where people fall, and how they fell before they became profitable.