The only type of statistical edge I can find is razor thin after commission/slippage and probably not scalable. It's automated and took me a year to figure out how to make. How in the hell do you know if you have a discretionary edge? I've done so many hours of back testing automated strategies only have a couple things that work. Manuel back testing on the other hand takes so long only to find out if each idea I try works ( they never do ) Countless hours of studying charts /back testing manual ideas and it seems that nothing is working. I must be retarded because I've been at this for over 3 years . I've heard that the best edges are not programmable , is this true? What should I focus on Discretionary or System trading?