It's a lot like playing poker. If you look at the results of a hand it's very likely you'll get the wrong idea of how you were supposed to play it. Even when

It's a lot like playing poker. If you look at the results of a hand it's very likely you'll get the wrong idea of how you were supposed to play it. Even when you make the right play you still expect to lose some amount of time. Or when you're buying stock, you might expect the stock to go up by 100 points 10% of the time and down by 3 points 90% of the time. Just because the stock lost 3 points doesn't mean you were wrong to buy it (you expect to make 7.3 points in the long run). See also: Expected Value