Thursday, February 10, 2011

What Kind of Stop-Loss Order Should a Trader Use?



In this article we will discuss the various ways to implement a stop loss order. Every trader who has had dealings in any of the financial markets is familiar with placing and executing a stop loss order, but many are mistaken that a stop loss order is always numerical. On the contrary, there are many traders (even professional hedge fund managers) who use what is colloquially termed a “mental stop” which stop is a stop loss point determined by factors other than the price, such as events, volatility, volume, option positioning, or any other comparable data. Such a stop is no less valid than a numerical one, and certainly no less effective, but one does need a lot more discipline to execute it successfully.
The great advantage of a non-numerical stop-loss order is its partial immunity to price swings. If the trader has confidence in his analysis, and is satisfied that standing firm in the face of market volatility is sensible and acceptable given the major dynamics and currents in the market, maintaining positions with non-numerical stop loss orders can be advisable and lucrative. In order to manage the inevitable large swings in account value, professional managers will implement hedging strategies in addition to money management methods, to control and minimize the volatility of the portfolio. Thus, even if the mental stop triggers a large drawndown in our position, we can minimize the effect on the portfolio through diversifying and distributing the risk among various currency pairs.
Let us examine the various ways of implementing a stop-loss order now.

Equity Stop

An equity stop is one where the position will be closed in case the total equity in an account falls below a certain value. A stop loss at 2 percent of total equity is generally regarded as a conservative strategy, while the maximum is 5 percent for most money management methods. Thus, to give an example, a 1000 USD account would have the stop loss for an open position at the point where to the total equity would fall below 980 USD.
Both the disadvantage, and the advantage of the equity stop is its inflexibility. The equity stop provides a very solid criterion for deciding on the success or failure of a single trade, as there’s no way of being mistaken about an account in the red. On the other hand, the same inflexibility may prevent the trade from functioning as expected. The markets are volatile, and a trade that has a perfectly valid cause behind it may yet be invalidated by the random fluctuations that are not predictable.
Another important problem with the equity stop is its inability to prevent a string of losses. For instance, when the trader closes a position at a two percent loss, there’s nothing that will prevent him from opening another position in the same direction (buy or sell) a short while later, if the causes that justified the first trade are still in place. For instance, if the trader enters a sell order when the RSI is above 80, and consequently the stop loss is triggered, and the position closed, there’s little that will prevent the same events from being repeated if the price action repeats the same movements. In order to avoid this pitfall, the trader can tie the stop loss point to a non-price factor, and the rest of this article discusses such scenarios.

Chart Stop

In a chart stop, the trader will place the stop loss order not at a price point, but at a chart point which may be static or dynamic. For instance, a stop loss order may be placed at a fibonacci level, which would be a static value. On the other hand, the trader may use an API (an automated trading system), or mentally prepare himself to close the position if a technical event, such as a crossover, a breakout, or divergence occurs, which would constitute a dynamic stop-loss point. In all these cases, technical analysis generates the triggers and determines the price where the position must be closed.
The chart stop is more flexible and reliable than a direct equity stop, because it adjusts to price action and volatility, and is therefore somewhat independent of the random movements of the price. The problem with the chart stop is twofold. First, the technical indicator used to generate the signals may fail to capture the change of the market trend, resulting in large losses. The other, and obvious problem is related to the indirect character of the stop-loss mechanism. Because the order is independent of the price, it may not be able to cut losses as effectively as a direct equity stop, and larger than expected losses may materialize as a result

Volatility Stop

A volatility stop depends on volatility indicators, such as the VIX for determining the exit point for the trade. As such, market panics and shocks will cause the order to be executed, but mere price fluctuations in the currency market which lack their counterpart in other asset classes will be ignored for the most part. The trader who utilizes a volatility stop expresses the opinion that unless a major, unexpected shock hits the market, his position should be held regardless of the behavior of the markets. This is a more risky strategy than the equity stop, but can be profitable and valid depending on market conditions and the economic environment. In general, it is doubtful that a volatility stop can be very useful in a very nervous and volatile market. But it could be very helpful in maintaining a long-term position where risk perception is low.
The volatility stop is sensitive to prices, but only in an indirect manner, and its nature is similar to the chart stop. It is useful for eliminating very short term distortions from our analysis, and allows us greater resilience in the face of noise in the data.
Volatility may fail to react to market swings. Sometimes a large fall in the market has no equivalent rise in the various volatility gauges. Similarly, volatility can at times rise without any obvious corresponding price action. Consequently, a volatility stop (and similar stops based on non-price data) can be triggered even before a trade is in the red. All these must be kept in mind if the trader decides to use this type of stop order.

Volume Stop


When the trader expects an ongoing trend to be reversed or invalidated subsequent to a change in volume, a volume stop maybe appropriate. While volume statistics are not available for the forex market, positioning as depicted by the COT report can be used for establishing this type of stop. For utilizing the order, the trader determines a percentage value on futures positioning above or below which the position must be liquidated, depending on market conditions and the nature of the order. In the same context, other types of data can also be used to generate a stop loss trigger point. A particular put/call ratio, or option risk reversal value may all be chosen to provide the equivalent of a volume stop in the stock market.
In example, let’s consider a trader who opens a short position in a carry trader pair, confirming his trade by developments in the stock market. His expectation is that the recent rise in the stock market indexes (and the corresponding rise in the carry pairs) occurred on low volume, and will soon be reversed in the absence of new money flows. Consequently, he places his stop-loss at a volume level which, if reached in a rising market, will invalidate the starting premise, and cause the position to be liquidated. When this occurs, and volume rises above the preconceived level, the trader will close his short position in the carry trade pair.

Margin Stop

The margin stop is not really a stop loss order, but the absence of it. In this case the trader will let his account absorb the unrealized losses until a margin call is triggered, and a large part of the account is gone. The margin stop is a sign of indiscipline and lack of insight, because a diligent trader will always predetermine the conditions that will lead to the closing and liquidation of a position. Since not even the brightest analyst is capable of predicting the future with any certainty, lack of a stop loss order is an indefensible practice.
Notwithstanding the previous, the margin stop is a popular choice among many traders who are unable to remain calm in the face of the great emotional pressures of trading. It is only viable under really low leverage such as 2:1, and even then a margin stop would not be the best choice. At much higher leverage, the margin stop is completely indefensible, and should be avoided altogether

Event Stop

Fundamental analysts do make use of technical tools, if only for determining the trigger points for a trade. Take profit, and stop loss orders are used by almost every trader in the world, and its is unthinkable that a serious analyst will not have a condition, at least in mind, for closing an open position, however convinced he may be of its ultimate validity.
But fundamental analysts are not limited to technical tools and the price action for determining when to exit a trade. The event stop that we would like to discuss here is a tool that the trader can use to determine a trade’s exit point.
When using the event stop, the trader will ignore the price action for the most part (and will use low leverage), and will only close a position in the red when the scenario he had pictured in his mind becomes contradicted by events. For instance, a trader is anticipating that Bank A will be nationalized by the authorities of Nation X, and he expects that this will lead to X’s currency depreciating against its counterparts. In consequence, he shorts it. He will refuse to close the position until authorities confirm and clarify, in a solid and unmistakable fashion, that they will refuse to nationalize Bank A. In the meantime, he will be willing to put up with all the rumors, extreme swings, and short term fluctuations in the market without worrying about the unrealized profit or loss in his account.

As we mentioned at the beginning, the event stop is for those traders who know what they do, and who possess the track record, the intellectual background, and the confidence to use it. But do not take our word in order to evaluate your own skills; you should know yourself better than anybody else, and if you believe that you understand the economic dynamics of the era, and can defend your claim in your trading activities, you will be perfectly capable of using the event stop.

Conclusion

The best choice for the beginner is the equity stop. During the learning process, the trader can concentrate on bettering his understanding of the markets without worrying about excessive losses. Once the trader gains a good understanding of market dynamics, and is able to form and implement his trading plans, the equity stop will quickly lose its attractiveness.
The best method for using the non-price stop orders is combining them with a wide equity stop which will serve as a final safety precaution in case the price action becomes too dangerous. For instance, a trader can long the EUR/JPY pair and hold it indefinitely until the VIX registers a value above 35, where a v9olatility stop would be placed. At the same time he will protect himself from extreme, and unexpected swings by placing an equity stop at 5-7 percent of total equity. Thus, unless a very large price swing completely overruns the main criterion for the stop loss order, and triggers the equity stop, the trade would be maintained indefinitely.
Needless to say, every trader will have his own choices on stop loss orders. And we would like to conclude this section by noting that the key to a successful stop-loss order is a disciplined risk management strategy, and everything else is just detail.



Predicting Market Extremes Using the Put/Call Ratio

Options have long been popular with forex traders for hedging, for directional bets, maximizing profit or for more complex strategies that are out of the scope of this article, but over the years, the record of options trading for buyers has not been stellar exactly. Predicting market direction in a specific time frame is always a difficult endeavor, and when the options trader must make those predictions in strict adherence to the terms of the options contract, the chances of success plummet. About 90 percent of option buyers eventually lose money, in sad testimonial to the difficulty of market timing.

Option writers have been increasing the types of available contracts to satisfy the hunger of the crowd for these instruments, and if not for the recent economic crisis, the volume and diversification in this market would certainly have continued to accelerate. In spite of all that, the basic puts and calls remain the most popular tools for the trader who desires to try his luck in this field, and there’s always a great deal of demand for the ever increasing supply coming from option brokers.
The attractiveness of various types of options to the trader mostly arises from the limited nature of the risk. For instance, a stock trader who shorts the firm X will face unlimited losses if the firm’s price moves in the other direction, but if he simply buys a sell-option on the firm’s stock, the maximum amount he could lose will be limited by the value of the contract ( in the same case, the option writer’s risk is unlimited, in theory). But that aside, there’s no reason to think that on a basic level options trading is any different from spot trading, and the similar nature of the spot forex market to the options market will be the basis of our market predictions.
Before examining the nature of the put/call ratio, and its significance for forex, let us remember that a put option is a contract that allows the buyer to sell an underlying asset at a specified price, and a call option is the kind which allows the buyer to buy the underlying asset. Thus, a buyer of the call option is expressing a view that the price will be higher at a specific point in the future, while the buyer of the put option believes that the price of the underlying asset will fall.
Now, what happens when euphoria (or panic) overtakes a market , and a bubble is created, as spot traders of any asset flock to grab a share of some security or futures contract on which options are available? How will the options trader’s reaction to the bubble be? Of course, the option trader is no different from the spot trader, and the bubble in the spot market has its mirror image in the options market as well. In other words, it is possible to identify extreme values in the spot market by looking at how ebullient option traders are, and the put/call ratio is utilized in a contrarian fashion to identify and exploit these extreme values for profit.
As most of us know, a contrarian strategy focuses on finding undervalued or overvalued assets in a market, and betting against the market in those assets to exploit the correction that will inevitably occur. It is always possible to define oversold or overbought values on the raw price data, and to make counter-trend wagers on that basis, but the highly volatile nature of the forex market makes this a relatively risky effort. That is why the trader always attempts to confirm his positioning with reference to more than one type of data, and with the volume data gained through the usage of the COT report, and the put/call ratio options market extremes can help traders identify opportunities in the spot market. We calculate the put/call ratio by dividing the total amount of puts by the amount of calls and on that basis get a value that reflects the bias of the market. For example, if there are 24000 put options on EUR/USD, and 60000 call options, the put/call ratio would be 0.4 implying a bullish market. The put/call ratio will rise as sellers drive the trend, and it will fall as the buyers are more numerous. As positioning reaches extreme values, so will the put/call ratio, until a point is reached where the drivers of the bubble are exhausted, which is usually followed by a violent collapse. We can identify the values registered during past collapses, and by comparing the value of the put/call ratio with past data, we can gain an idea on the market direction in the near future.
Trading the put/call ratio depends on identify the put/call values registered during past price extremes, and comparing that with today’s values, as we mentioned before. If a breakout or spike is not confirmed by an equivalent change in positioning in the options market, we will be reluctant to act in the direction of the trend. Such a situation would signify that options traders are not convinced by the action in the spot, and do not believe that it will lead to a sustainable price action. Since many speculative deals in the spot market are hedged in the options market, lack of a confirming movement could suggest that the price action is driven by less-informed, smaller players. For contrarian trades, we will take note of extreme values in options positioning, and will enter counter-trend orders in anticipation of the collapse. This method is really straightforward, allowing the trader ease of mind and clarity of analysis.
Let us also remember two of the difficulties which this method poses for the trader.
1. Needless to say, the definition of extreme value is arbitrary, and there’s no way of knowing which of the previous peaks will hold, or if a new peak in the put/call ratio will be registered as a result of market action. This means that the trader should be cautious about using options market data for the exact timing of market reversals. There’s no magical quality to the put/call ratio, since quite often option traders also trade the spot market in forex, for the reasons mentioned at the top of this article.
2. Options traders are just trader, and there’s no reason to expect to be any smarter than spot dealers. Indeed, studies show that, if anything, they are more likely to suffer losses as a result of directional bets.
We conclude this section by noting that the data on put/call ratios, and trader positioning can be obtained from the CBOT website.