交易者沉迷於各種交易方式中：長線交易，日内交易，剝頭皮，振蕩交易等等。長線交易通常持續很多天，而剩下的則是通過幾分鐘到幾個小時的短線交易來獲利。為了取得最優交易結果，交易者通常依賴於各種技術指標來預測價格走勢。你將從本文中發現波段交易者是如何利用佈林通道以及平均趨向指標來實現盈利的。
波段交易是投資者尋求快速盈利的一種。它與日交易類似，只是交易者不需要長期持倉。它可以是一個小時，一日或者是幾日。如果市場條件事宜，波段交易者可以在幾個小時内完成一筆交易。因此，為了充分利用價格走勢，波段交易者需要知道那些可以為他帶來預期盈利的指標。佈林通道以及ADX（平均趨向指標）將會很好的幫助波段交易者利用趨勢振蕩。下面，讓我們詳細地了解它們。
佈林通道：由於能夠顯示價格可能的反轉點，佈林通道是波段交易者衆所週知的一個技術指標。它由三條曲線組成，這三天曲線是根據移動平均線以及標準方差演變而來。中線是某一時間段的價格移動平均線，上下通道線則是中線的標準方差。通常，中線是20日MA，上下通道線是中線的2倍標準方差。
使用方法：當價格突破上通道線時，便被認為是“超買”，表明價格清算以及獲利平倉。相反地，價格下穿下通道線則表明“超賣”，說明倉位虧損。如果價格從下通道線上升，那麼中線將會是第一個阻力位，此時如果交易量持續增加的話，那麼價格繼續上升並接近上通道線；價格從上通道下降時，那麼中線將會是第一個支撐位，如果價格跌破支撐位並繼續下降，那麼下通道線將會是下一個需要留意的支撐位。
ADX（平均趨向指標）：佈林通道顯示的是價格有可能的轉折點，而ADX指標則可以判斷出趨勢的是否強勁。ADX指標是DX（定向指標）的N週期的指數移動平均數。定向指標由2條指標組成，即+DI正趨向指標和-DI負趨向指標。+DI計算上升力量的強度，-DI計算下降力量的強度。它們都繪制在ADX圖表中，範圍在0~100之間。指標的標準週期是14.
使用方法：當ADX指標大於40時，說明當前價格走勢強勁；ADX小於20說明趨勢微弱。換句話說，只要ADX指標線高於40且呈上升趨勢，就說明當前趨勢將持續（熊市或牛市）；如果ADX低於40且方向向下，則表明價格將可能反轉。同樣地，如果ADX趨勢線位於20以下並呈上升趨勢，說明當前價格走勢的動能正在增加。
在下面的文章中，你將發現佈林通道與ADX指標將如何有助於交易。
策略：如果價格試探佈林線的上通道線或下通道線，就有可能反轉，反轉強度可以根據ADX趨勢以及水平位確定。
示例1：如果價格正在佈林上通道線處探頂，觀察ADX是否低於40且方向向下，如果是，則說明賣方壓力，目標位可以是佈林中線或者下通道線。
四小時圖：上面歐美的四小時圖展示了如何使用佈林線以及ADX交易。上圖中我們能看到，價格收於佈林上通道線上方1.3265處，說明價格處於超買區，多頭獲利平倉。下面的ADX指標窗口中，ADX方向向下也說明當前的價格上升趨勢即將反轉。價格下探佈林下通道線1.3030處，說明價格有可能回調。因此，空頭應該在該處平倉獲利。
1小時圖：價格下穿佈林通道的下通道線、ADX也向下表明此次清算過後趨勢很有可能發生反轉。因此，在下通道線處買入後繪出一條趨勢線，我們應該在價格上探上通道線之前持續持倉。也就是在1.3390價位買入，在1.3430賣出，我們可以盈利40點。示例2：如果價格突破佈林線下通道線（上通道線），ADX位於20下方且方向向上，說明價格將會上升（下降）直到佈林上通道線（下通道線）或者ADX向下反轉。
四小時圖：上圖顯示歐美突破正常交易區間後迅速上升至1.2730水平，並得到ADX支撐（大於20且方向向上）。也許你會說，價格上探佈林上通道線很多次，這足以說明賣方壓力。但你需要註意的是，價格沒有一次收於通道線上方，僅僅是靠近上通道線不足以說明市場處於超買階段。
1小時圖：價格處於區間一段時間之後突然產生賣方壓力，此時ADX指標大於20且處於上升趨勢中，表明價格的賣方壓力將會持續。在該位置做空並以價格收於佈林通道線下方為目標。這個例子中，1.3030做空，1.2970平倉，將會獲利60點。
等級: 三星級（最高為五星級）
反饋：從振蕩區間交易者來看，該指標很重要。但是它的局限是沒有止損：當倉位與價格走勢違背時，該策略不會發出平倉提示。因此，需要格外的小心。當價格走勢逆轉時，你可以使用別的指標來提供平倉信號。
Swing trading with the help of Bollinger band and ADX
Traders indulge into various kind of trading: positional trading, intraday-day trading, scalping, swing trading, etc. Where positional trading is of longer duration, the rest of them are of shorter duration ranging from a day to just couple of minutes to take the required benefits. In order to get the optimum gains they depend on various technical indicators which help them to forecast movement on the basis of given price chart. In the following article you’ll find how a trader can benefit from two basic indicators namely, Bollinger band and ADX in order to get required benefits from swing trading.
Swing trading is a type of trading wherein investors look for quick gains. It is very similar to day trading wherein investors don’t hold their positions with long term scenario. It may be for an hour, a day or couple of days that a swing trader is looking for. Given the opportunities provided by market movement, swing traders enter and exit the market in the same day or may be couple of hours. Hence, in order to capitalize the market moves we should know such indicators which help gain the required return as soon as possible. Bollinger band and ADX (Average Directional Movement Index) are two such technical indicators which help benefit from price swings. Let’s understand them in detail.
Bollinger band: Bollinger band is a widely known technical indicator for swing trading as it indicates the probable turnaround in prices. It consists of three curves which are drawn with the help of moving average and standard deviations. The middle band is a moving average of a definite period, where as the upper and lower bands are standard deviations of the middle line. Generally, Middle band is made up of 20 day moving average while upper and lower band are at 2 standard deviations of the middle band.
Usage: When an underlying moves outside the upper Bollinger band, it is considered "overbought" indicating probable profit booking and price liquidation. Conversely, when an underlying trades below the lower Bollinger band, it is considered “oversold” and indicates prices to cover the losses. In case the underlying quote has moved up from the lower band, then middle band would be the first resistance while sustained trading above middle band would lead the quote towards upper band. In case of quote moving down from the upper band the first support would be middle band, if it fails to sustain that support; lower band would be the next level to watch.
ADX (Average Directional Movement Index or Average Directional Index): While Bollinger band indicates a probable turn around, ADX indicates the strength of the existing price move. ADX is exponential moving average of Directional Index (DX) for a specified period of time. Directional Index is made up of two indicators, namely, positive directional indicator (+DI) and negative directional indicator (–DI). The +DI calculates the strength of upward move while the –DI calculates the strength of downward move. Both of them are being plotted with the ADX in the indicator window between a bounded range of zero and 100. The standard time period used in this indicator is 14 periods. Usage: When the ADX is above 40 level, prevailing trend is considered to be a strong one while in case of ADX trading below 20 level, it indicates a weaker trend. In other words, as far as the ADX line trades above 40 level with upward trend, it indicates continuance of the prevailing trend (Be it Bullish or Bearish) while a down ward turn below 40 level would indicate a probable change in trend. In a same way, if the ADX line is trading below 20 level and showing the sign of increase, the prevailing trend is expected to gain momentum.
In the following article you’ll learn how Bollinger Band and ADX (Average Directional Movement Index) would help in swing trading.
Strategy: If the underlying quote is testing upper or lower band of Bollinger, it is expected to reverse, the strength of reversal can be known with the present level and trend of ADX.
Example 1: If the quote is trading above upper band of Bollinger, look for the ADX if it is ranging downward towards below 40 level then selling pressure is expected with the targets of middle band and then lower band of Bollinger.
Four Hour Chart: Above mentioned four hourly chart of EURUSD describes how to trade with the help of Bollinger band and ADX. As we can see, the quote crossed the upper band of Bollinger closing above 1.3265, indicating overbought scenario and expectation of profit booking. At the lower panel, a dip below 40 level in ADX also signaled change in the prevailing buying. The trend reversal was supported with the descending trend line on ADX. The quote tested the lower band of Bollinger near 1.3030 indicating a probable turn around in prices. Hence, an investor should book full profits at 1.3030.
Hourly Chart: Above mentioned hourly chart of EURUSD gives another example of how to trade with the help of ADX and Bollinger band. The quotes traded below the lower band of Bollinger and ADX was also trending downwards indicating a probable trend reversal from the existing liquidation. Hence, by buying at the lower band of Bollinger and drawing a trend line, we should hold our position until the quote tests upper band of Bollinger. As per above mentioned strategy, by buying near 1.3390 and liquidating positions near 1.3430, we can make profits of 40 bps. Example 2: If the prices give breakout from the lower area of Bollinger (or upper area) with ADX ranging upwards from below 20 level, it is expected that prices will trade higher (lower) until the prices gave close above upper band of Bollinger (or below lower band of Bollinger) or the downtick in the ADX, whichever comes first.
Four Hour Chart: Looking from above mentioned four hourly chart of EURUSD, it can be observed that sudden spurt in EURUSD quote breaking the normal range and forcing the quote to trade above 1.2730 level was well supported by ascending ADX above 20 level. One wouldargue that the quote have touched upper band of Bollinger many a time which should indicateselling, But it should be bear in mind that none of the time it has given a closing above Upper Bollinger Band, merely trading near the upper band would not indicate an overbought market.
Hourly Chart: Above mentioned hourly chart of EURUSD gives another example of how to trade with the help of ADX and Bollinger band. As the prices were trading in range and sudden spurt of selling initiated, one should look for the ADX which is reversing from 20 level indicating the selling pressure has a strength and would continue. Taking sell position at that level one should have the target of a close below lower Bollinger band. In this example, 60 bps (the difference between 1.3030 and 1.2970) were the gains generated with the help of this strategy.
Rating: 3 out of 5 stars
Feedback: The strategy seems important from the swing trader’s point of view but the point of limitation is stop loss orders. The strategy is mute regarding the point of exit from the existing position in case of adverse price movement. Hence, in order to take due care, it is always expected to use certain other indicators which provide stop loss point in case of adverse price movement.
文章翻譯由兄弟財經提供
本文來源：http://www.fxstreet.com/education/fundamental/swing-trading-help-of-bollinger-band-adx/2013/05/07/