Quote from intradaybill:
No, absolutely wrong. It depends on R:R and risk percent. Win rate can be 10% but avg. losers .1X avg. winners. In this case the profit factor is 1.11, a profitable startegy. If in addition 0.1% of account is risked per trade, ruin is improbable.
Win rate 90% and avg. winners 0.1x avg. losers (typical numbers of suicidal scalpers and geek day traders). Profit factor is 0.9, a losing strategy. Ruin inevitable.
Win rate is irrelevant as far as ruin because money management plays a role there. I don't need to read books to understand simple math.
Quote from N54_Fan:
The fact that you are risking ONLY 0.1% of your acct on this terrible a win rate means that you will have low risk of ruin....THAT is your money management (position sizing) that is keeping you alive. However, if you only risk 0.1% you will also have low profit and it will be hard to beat the market...NOT impossible but HARD. Your profit factor of 1.1 is saying the exact same thing I pointed out in detail on my prior post. The point is NOT whether the system is profitable or not! The point is wether in REAL WORLD trading will most of us be profitable with such a system of low probability? The answer to that is definitley NO in my opinion. I know that after 20 losers in a row I would definitely question my system and I would probably LOWER my risk per trade because I would be gun shy knowing I just lost 20 in a row!! Now when that winner of 13R comes (to even things out) I would win less because I risked less. Then you go back to risking more per trade and guess what 90% chance your a loser AGAIN. Maybe you dont need to "read a book" to know this "simple math" but have you done a MC Analysis on this system? I suspect not. Do it and make up some numbers and you will see a 10% win rate is terrible and not worth trading. Throw darts at the board or flip a coin and you will be better off with good money management skills.

Quote from intradaybill:
You missed the point. I used extreme examples to illustarte the irrelevance of win rate as far as ruin. Ruin depends mostly on money management given a positive profit factor. Profit depends on frequeny of trades. Some trend following funds with many years of positive perofrmance have 10% - 20% win rate because they get many small losers and a few winners that last for months or even years.
If you are talking about scalping or day trading then I agree that win rate is important in some cases. But unless you restrict talk to those styles, it is not and every experienced trader and his dog know that.![]()
Quote from Zr1Trader:
FWIW, my highest profit factor trend following methods have 2%-6% win rates.
Typically, trendfollowing=low winrate, mean reversion=high winrate