佈林通道®

佈林通道（Bollinger Bands）是 John Bollinger發明的，可以用來確認動量指標的交易信號。佈林通道由移動平均線加/減幾倍標準方差得出，可以顯示超買超賣區域。當價格波動幅度大時，佈林通道會隨之變寬；價格波動幅度小時，佈林通道則狹窄。佈林通道通常由20日移動平均線以及2倍標準方差得出，適合用於中線交易。

交易信號

示例 1

微軟公司如片以及20日  佈林通道，2倍標準方差。

收縮的佈林通道預示著接下來市場將會發生趨勢運動：佈林通道先形成狹窄的頸部，繼而價格迅速運動。第一次突破通常為假突破，接下來該突破的反方向會出現一輪強勁的走勢。[C] 處的收縮發生在1998年6月份：佈林通道的寬度僅為$2，7月份突破後走出一個新高。

盤整期，如果佈林通道的一侧先開始變化，則價格的真實走勢通常會是另外一侧。

K線位於佈林通道的外侧表示趨勢強勁並且很有可能持續——除非價格的迅速反轉。請註意八月上旬的快速反轉。
價格走勢位於佈林通道的一侧表示趨勢強勁並有可能持續。等待動能指標的信號背離，這將預示著趨勢的終結

設定

佈林通道的預設設定是2倍標準差以及20日指數移動平均線。可以通過編輯指標設定更改參數。

Bollinger Bands®
Bollinger Bands were invented by John Bollinger. Used to confirm trading signals, normally from a Momentum Indicator, the bands indicate overbought and oversold levels relative to a moving average.
Bollinger Bands are calculated at a specified number of standard deviations above and below the moving average, causing them to widen when prices are volatile and contract when prices are stable.
Bollinger originally used a 20 day simple moving average and set the bands at 2 standard deviations, suited tointermediate cycles.
Trading Signals
EXAMPLE 1
Microsoft is charted with   20 day Bollinger bands at 2 standard deviations.
Contracting bands warn that the market is about to trend: the bands first converge into a narrow neck,followed by a sharp price movement. The first breakout is often a false move, preceding a strong trend in the opposite direction. A contracting range [C] is evident in June 1998: the bands converge to a width of $2, followed by a breakout in July to a new high.
A move that starts at one band normally carries through to the other, in a ranging market.
A move outside the band indicates that the trend is strong and likely to continue - unless price quickly reverses. Note the quick reversal [QR] in early August.
A trend that hugs one band signals that the trend is strong and likely to continue. Wait for divergence on aMomentum Indicator to signal the end of a trend.
EXAMPLE 2
Microsoft Corporation:   20 day Bollinger bands at 2 standard deviations and   10 day Rate of Change.
1. Go short [S] - bearish divergence on ROC.
2. Contracting Bollinger Bands [C] warn of increased volatility. This begins with a false rally (note the ROCtriple divergence) followed by a sharp fall.
3. Go long [L] - price hugs the lower band, followed by a bullish divergence on ROC.
4. Go short [S] - price hugs the upper band, followed by a bearish divergence on ROC.
Setup
The default settings for Bollinger bands are 2.0 standard deviations around a 20 day exponential moving average. Edit Indicator Settings to change the standard settings.
See Indicator Panel for directions on how to set up an indicator.

本文翻譯由兄弟財經提供

文章來源：http://www.incrediblecharts.com/indicators/bollinger_bands.php