you may be right, twistedheat. it may be fear prompting the early exit. however, consider the following. when you enter a trade, do you not have a picture in mind of where the security should be heading? now, if you see a trade going wrong right off the start. is it better to just take what you can out of the trade? or, is it, as you said, that the stop loss should already be taking this into account and the trade should be left alone to either make a profit or get stopped out?
What I am currently learning/being taught is the concept of volatility. Volatility, for all intents and purposes, is the "noise" within your timeframe. Therefore, if you set your stop-loss based on the average volatility of the last "x" amount of bars, then this is how you can set yourself up:
- You enter stock XYZ long @ $50.00
- You know that the average volatility of the last 5 bars is $0.20
- Therefore your stop-loss is $0.20
Now, because you know that average volatility is $0.20, if the trade goes against your long position down to anywhere close to $48.80, it can be discounted as "noise" and probability of the trade going in your direction is still higher than it not.
If the trade goes down below $48.80, then the price has moved past the volatility i.e "the noise", thus now it is more probable that the trade will go against you as it is no longer just "noise".
In stocks like AAPL or RIMM, there is no point having a $0.10 stop-loss because in 1 one-minute bar, the price can vary by $0.20 to $0.60. If you had a $0.10 stop-loss and it hit, you might think the stock is changing trend direction when in reality that is just the "noise", and the trend is really continuing in the trend direction that you originally determined.
Also, that works vice-versa. If you have a $0.10 stop-loss but the average volatility is only $0.05, you might stay in a trade too long when in reality the trend direction was likely to have changed after the trade went against you $0.05.
If I was you, I'd really consider volatilty based stops and volatility based position-sizing.