Quote from LondonUSTrader:
I should clarify this by saying that I think there are two good methods of placing stops. First, a wide fail safe or emergency stop which is a long way away from the market and rarely if ever gets hit. This is more like an insurance policy against an unexpected event and 9/10 times your position will be closed before it gets hit. Second, to base your stop on current market conditions. This is often a tighter stop than the fail safe stop, but when it is hit 9/10 times it indicates your position was clearly wrong. As such it will usually get hit more often than a fail safe stop. I opt for the second approach as I like to base my methodology on current market conditions. This year my intraday stops on the ES have ranged from 2.5 to 9 points, depending on the current market conditions, with an average of 5 points. The reason I prefer this approach is because the market is different every day. Some days it makes sense to have a tight stop, other days the stops need to be wide when there is high volatility. A very important point here is that when there are significant changes in volatility those trading with tight fixed stops tend to get killed. That is why, IMHO, it is better to use a wide stop or a stop that adjusts for current volatility. I am sure the increased volatility in 2008 killed many trading with tight fixed stops even though those tight fixed stops may have worked well during 2004-2007.