Stops
If a system has a high frequency of trades (and any daytrading system has this charachter), tight stops usually work best. Systems that trade frequently are trying to make money almost on a daily basis. If the system takes a small loss, then there is always tomorrow; why take a major loss when you know a trade probably will be generated tomorrow?
Moreover, professional traders are well aware of how difficult it is to recover from drawdowns. A 50% loss requires a 100% return just to get back to break even. See here, % loss and % gain necessary to break even.
10% 11.11%
20% 25.00%
30% 42.85%
40% 66.66%
50% 100%
60% 150%
70% 233%
80% 400%
90% 900%
100% broke
Profit targets
Pure profit targets generally don't work. A good portion of the profit that is generated by an S&P day-trading system comes from those days when the S&P takes off and keeps going in the same direction. If you limit these potential high-profit days, then you limit the overall profitability (if any) of your system. 80% of your Profits will come from 20% of your trades (Pareto Principle: in any series of elements, a small fraction in terms of numbers always accounts for a large fraction in terms of effect).
If a system has a high frequency of trades (and any daytrading system has this charachter), tight stops usually work best. Systems that trade frequently are trying to make money almost on a daily basis. If the system takes a small loss, then there is always tomorrow; why take a major loss when you know a trade probably will be generated tomorrow?
Moreover, professional traders are well aware of how difficult it is to recover from drawdowns. A 50% loss requires a 100% return just to get back to break even. See here, % loss and % gain necessary to break even.
10% 11.11%
20% 25.00%
30% 42.85%
40% 66.66%
50% 100%
60% 150%
70% 233%
80% 400%
90% 900%
100% broke
Profit targets
Pure profit targets generally don't work. A good portion of the profit that is generated by an S&P day-trading system comes from those days when the S&P takes off and keeps going in the same direction. If you limit these potential high-profit days, then you limit the overall profitability (if any) of your system. 80% of your Profits will come from 20% of your trades (Pareto Principle: in any series of elements, a small fraction in terms of numbers always accounts for a large fraction in terms of effect).
