DislikedHowever, with every trading method, even the most discretionary one, performance metrics (win rate, ave win size, etc) can provide us with an expectancy measure (or edge, or profit factor, call it what you will), albeit within an appropriate confidence level based on the trade sample size. Any discretionary 'complexities' (e.g. scaling in/out, trailing a stoploss, etc) are inherently factored into these metrics.Ignored
I guess what I'm having trouble understanding is why anyone would need to know those stats, especially when the numbers can change according to market dynamics. A system with a great expectancy measure today could be turned on its head tomorrow, you've only got to look at the past 12 months to see a perfect example of how markets can change.
Despite all the number crunching and theory presented by people like the OP the reality of it is there are consistently profitable traders trading this market every day and making money, some of them have been doing it for years, it's hard to overlook practical results in favor of theoretical supposition.
Isn't the only real and relevant metric bottom line P&L, it's an indisputable number based on reality.