布林通道®

布林通道（Bollinger Bands）是 John Bollinger发明的，可以用来确认动量指标的交易信号。布林通道由移动平均线加/减几倍标准方差得出，可以显示超买超卖区域。当价格波动幅度大时，布林通道会随之变宽；价格波动幅度小时，布林通道则狭窄。布林通道通常由20日移动平均线以及2倍标准方差得出，适合用于中线交易。

交易信号

示例 1

微软公司如片以及20日  布林通道，2倍标准方差。

收缩的布林通道预示着接下来市场将会发生趋势运动：布林通道先形成狭窄的颈部，继而价格迅速运动。第一次突破通常为假突破，接下来该突破的反方向会出现一轮强劲的走势。[C] 处的收缩发生在1998年6月份：布林通道的宽度仅为$2，7月份突破后走出一个新高。

盘整期，如果布林通道的一侧先开始变化，则价格的真实走势通常会是另外一侧。

K线位于布林通道的外侧表示趋势强劲并且很有可能持续——除非价格的迅速反转。请注意八月上旬的快速反转。
价格走势位于布林通道的一侧表示趋势强劲并有可能持续。等待动能指标的信号背离，这将预示着趋势的终结

设置

布林通道的默认设置是2倍标准差以及20日指数移动平均线。可以通过编辑指标设置更改参数。

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.

本文翻译由兄弟财经提供

文章来源：http://www.incrediblecharts.com/indicators/bollinger_bands.php