You hear a lot of talk about risk/reward ratios in trading, and as an individual who enjoys math I find myself baffled at the methodology many employ to arrive at their risk/reward conclusions. For example, some traders firmly believe in keeping their stop loss and profit targets roughly equal. After all, they say, it is important to keep your risk on the upside the same as the risk on the downside. Is all risk the same?
For example, let’s assume an example where a trader establishes a 30 tick stop loss and a 20 tick profit target. Many would assume that this trader is letting his losses run and his or her profit targets stay finite. It’s an interesting argument, but I don’t necessarily agree with it.
Why?
Well, in this argument you have to assume that it is equi-probable that the market will rise or the market will fall. With so many variables under consideration, I don’t believe that the probability for an YM e-mini to rise or fall is equal. Further, what is the probability that the YM e-mini will rise 20 points versus it falling 30 points? In most trading situations, long or short, small measured moves in the market are far more likely than large sweeping moves. In short, the market is far more prone to equilibrium or movement contained to movement one or two standard deviations from the mean. Which is not to say that large moves in the market do not occur, they do. The important question to ask yourself is, how often does the market move in dramatic fashion versus how many times does the market move at a very measured pace?
This attitude allows trades to develop and gives a trader the time to allow them to develop. Further, because a trader sets his or her stops to 30 does not necessarily mean that he or she is required to allow the price action to plow into the stop loss. At any time during a trade it is the trader’s prerogative to shorten his or her stops. (As a quick aside, I would also point out that it is essential to only shorten your stops, it is never a good idea or sound trading practice to expand your stop loss). However, if the fundamentals of a trade change during the execution of the trade, there is no problem with making a hasty exit. It only makes sense to limit your losses, especially if the dynamics of your trade change.
In the last 10 years, it is far more likely for the market to move 10 points than 30 points. A quick back test of this assumption showed that 10 point moves are 32% more common than 30 point moves. Interesting. In this respect, it is difficult to apply traditional calculus probability theory to trading. In short, there is a dependent relationship, especially from a probability standpoint, in calculating the likelihood of a given market move; the market is far more likely to move in smaller moves than larger moves. This is an important concept to understand and can help a trader reassess his or her approach to managing risk. Standard understanding of binary outcomes in assessing risk do not necessarily apply in trading the YM e-mini.
As you might expect, I am a proponent of running wider stop losses than many. In doing this I allow my trade time to develop and understand that the variable most responsible for winning trades is time. You must allow yourself ample time for the trade to develop and running tight stop losses will generally deprive most traders of the time required to trade effectively. Market noise and related factors seem to knock many traders out of their trades before they can realize a profit.
In summary, I have made an argument for running longer stop losses and explaining my criteria for doing so. I base my beliefs on a simple maxim; the market is far more likely to move in small steps than it is in large steps. Further, I can employ this strategy in formulating my approach to trading and run the wider stops to let my trades develop. My enemy in trading is not the price action but the amount of time I give my trades to develop; if I limit my trading by employing tight stops I deprived myself of the time needed for the market move I expect. Market noise can knock me out of the trade prematurely and I will realize losses. I want time in my trading and I am willing to buy time by expanding my stop loss.
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