Quote from iloveoptions:
To add a bit more to ammo's already sound comments regarding averaging; No one knows were the high or low is going to come in. That is why a swing trader must allow a decent amount of room ( measured by the volatility of the market, risk tolerance of the trader,as well as account size) for two reasons: One, the swing trader will be able to withstand the games and the noise that mm like to play to shake out the weak players, and two, it allows that trader to smartly position themselves inside that wide range that was previously determined, before the market reaches the stop.
The odds are higher that the scalper gets their stops eaten many times more, with a whole lot of frustration, before the market reaches the swing trader's stop. Additionally, a good swing trader can add as well as reduce within this predefined range, and still come out even or better than your typical scalper, with much less stress.