Donchian Channels There are several different types of trading bands, envelopes and price channels from the best-known Bollinger Bands to starc and Keltner Bands. Each of these is similar in appearance but how traders use and apply them varies considerable. Channels are a trading favourite because they define general boundaries within which most of the price action should occur. The flow of prices within a channel has been compared to a river in a valley. When the river reaches one side of a valley, it turns back toward the centre or perhaps even the opposite side of the valley, depending on the path of least resistance. Like a river, prices also will occasionally jump their channel banks when there is a torrent of buying or selling. A less familiar type of channel is known as a Donchian Channel, named after Richard Donchian, a pioneer in developing technical analysis techniques and managed futures funds going back to the 1940s. The basis of the Donchian Channel is rather simple: the high close and the low close for the last N periods form the upper and lower boundaries of the channel. Analysis of the Donchian Channel is similar to other channels. In general, the channel helps you see where you might expect to find support and resistance - in this case, based on actual high and low closing prices for a specified period rather than a percent variation from a moving average as is the case with some other channels. Donchian developed his trading technique based on a breakout of the price range – a classical approach later included in several trading systems, notable the Turtle trading system and a number of mechanical price-range breakout approaches. This is enhanced visually by drawing price channels and identifying closes outside the channel lines. Whilst this approach may be traded systematically as a breakout, the trader’s chances of success are increased if there is already a trend in place or beginning to establish itself. Let’s look at a chart of crude oil and draw a Donchian channel to examine the trading possibilities. Here we have drawn an upper boundary based on the high prices over the previous 20-day period and a lower boundary based on the low prices over the same period. This is a variation of the Donchian Channel in that he took closing prices rather than high or low price extremes. It is always important to trial and error and back-test with any technique until you are comfortable that it suits your trading style. The application of highs and lows rather than closing highs or closing lows merely reflects a different style rather than a different technique. We have also used a 20-day period whereas Donchian favored a 4-week or 30-day period. The first breakout occurs in May when the price closes outside the upper channel. This is a signal to enter a long position. There are two possible entry triggers: either place a buy order at just above the high of the period or wait until the price has been established as the closing price for the day and place a buy order for the open on the next day. This buy order should be placed just above the high for the previous day and sometimes may not be triggered straightaway. The direction of the channel is important in deciding whether to enter the trade. If the channel is moving up, trade from the long side, buying on a breakout above the upper channel or on dips to the lower side of the boundary. In the three long entry signals shown as blue arrows the entry was taken only if the upper channel line was pointing in the same direction as the signal. Two of the three long breakouts led to profitable positions. The third marked as FB was a false breakout and was a high for the period. If the channel is pointing down, it is appropriate to trade from the short side, selling on a breakout from the channel or on rallies to the upper side of the boundary. In this example there was a profitable short position, shown by the red down arrows in early September. Another approach would be to use the mid-point line as your trigger point (the mid-point may be the mid-way point between the two boundaries or, as here, we have selected a 20-day moving average). When prices fall below the mid-point, sell; when prices cross above the mid-point, buy. Of course, that approach has the same problem as many others in choppy, sideways conditions. It may result in whipsaws and false entries. We would then suggest that an appropriate filter is also applied to decide on the suitability of taking a position. Here we show the same chart but with a Detrended Price Oscillator (DPI) drawn at the bottom of the chart (see The A to Z of Technical Indicators for a full explanation of how this indicator is applied). The oscillator shows a divergence from the price action where the peaks in the DPI do not coincide with price peaks during July and August. This is likely to have kept us out of the false breakout trade in early August. It also signaled confirmation of the long position to be taken in October. Finally we show the same chart with Donchian’s 4-week (30-day) channels (drawn as green lines). For the long entry triggers two of the entries were later than with the 20-day entry although the short position had the same entry point. Generally the 30-day trigger will lead to fewer trades and whipsaws whilst capturing the majority of the longer, trending moves. With channels, you often get a second chance to buy or sell as the market tests its boundaries and then reverts back to a more normal mid-point position, but keep in mind that a channel is only a guideline. For better signals, you should combine the use of a channel with a technical indicator that highlights divergence with prices. The intention behind this introduction was to emphasize the validity of Donchian breakout approaches to trend trading, particularly where entry is concerned. However the Donchian approach does not provide a ready exit strategy although it offers several alternatives. The successful trader always knows what the initial risk is with every trade and also has a clear exit strategy to get out of a winning trade (or a losing one). Exit strategies were discussed in our previous Newsletter available on the Articles and Downloads page and feature strongly in both our E-Books. With the application of Donchian channels three exit strategies are suggested for review by the trader: 1. An exit when prices move to the lower end of the price channel in the event of a long position i.e. draw a mid-point line and exit when this is crossed. This is in effect a 50% retracement line and would normally be suggestive of a price reversal or a profit-removing correction. 2. Apply an N-day simple moving average of closing prices and exit when this is crossed. The period may be the same as the channel N- day period although we would tend to apply a 20-day moving average for a 30-day channel. This trailing stop is also changed daily and should move closer to the price action as the price range contracts. 3. Use a trailing stop based on an N-day low for long positions or Nday high for an exit from a short position. For example if a 20-day Donchian channel is selected for a long entry, then take the low price (or low closing price) of the past 10-day period and use it for the exit price. This may not change daily although the 10-day low must be monitored and updated if a new low is made. Whichever exit strategy is adopted, Donchian channels provide an excellent entry for riding a trend.