People who have a background in game theory understand this well. The statistics are only meaningful when looking at a string of numbers. For example, in professional football, not every play is going to gain yardage. Theoretically, yes, but in real life it doesn't always work that way. A trader is likely to manage a position differently depending on whether the previous trade was a winner or a loser.
Successful traders are very defensive of their capital.
They are far more likely to exit a trade that doesn't work right away than to give it the benefit of the doubt. Realistically, every trader has made a stubborn, big losing trade. This means, immediately get rid of half your position. Cut down the size. Right off the bat you are taking action instead of freezing up.