約翰•佈林在他的網站上描述了佈林動量指標（Bollinger %b indicator）。佈林帶（Bollinger Bands）是根據20日簡單移動平均線加/減2倍標準差得出。佈林動量指標顯示了收盤價與佈林帶的關系。佈林在其網站上也描述了另外一個獨立的指標：佈林波幅指標（Band Width Indicator），它可以反映佈林帶的寬度。
佈林動量指標交易信號
佈林描述了以下可用於市場處於上升/下降趨勢中或處於調整期的交易信號：
趨勢市場
• 如果佈林動量指標回撤到負值（比如，收盤價位於佈林帶下方），並且第二次回撤佈林動量指標為正值，則應做多。
• 如果佈林動量指標反彈大於100（收盤價位於佈林帶上方），並且第二次反彈低於100，則做空。
利用威爾斯懷爾德的相對強弱指數所顯示的失敗的震蕩（failure swings）來確認信號。
示例：
高盛集團股價以及20日佈林動量指標。
1. [L] 處做多：前一波佈林動量指標最小值低於0，而這次回撤最小值大於0。
2. [X] 處平倉：之前佈林動量指標反彈大於100，而這次反彈沒有突破100.
3. [L] 處做多：前一波佈林指標回撤達到0，而這次位於0之上。
4. [X] 處平倉：佈林動量指標從100以上持續下跌，出現空頭背離。
佈林波幅指標（Band Width Indicator）
佈林波幅指標（Band Width Indicator）可以對趨勢波動性的變化發出預警。佈林帶變窄之後，接下來通常會伴隨著波動量的快速增加。佈林波幅變窄，對應的佈林波幅指標低於2.0%。S&P 500指數的佈林波幅指標小於2%時會導致很多的投機行為，但需要驚醒的是，市場在真實的趨勢開始前，通常會先開始一個假動作。
高盛將顯示20日保歷加通道寬度。
示例：
高盛集團股票已經20日佈林波幅指標。
1. [L] 處做多：佈林波幅指標在收縮到歷史低點後開始上升。
佈林波幅指標要求波動收縮在2.0%以下，但是較寬的縮幅也可以提供足夠完美的交易信號。
佈林動量指標設置
佈林動量指標以及佈林波幅指標的默認設置為20日簡單移動平均線加/減2倍標準方差。
佈林動量指標公式為：（收盤價 – 上佈林線）/（上佈林線– 下佈林線）。
佈林波幅計算公式為：（上佈林線–下佈林線）/同一時期的簡單移動平均線。
Bollinger %b Indicator - and Band Width Indicator
Bollinger %b is described by John Bollinger on his website. It indicates the position of Closing Price relative to Bollinger Bands® plotted at 2 standard deviations around a 20-Day simple moving average. Bollinger also describes a separate Band Width Indicator that reflects the width of the Bollinger Bands.
Bollinger %b Trading Signals
Bollinger describes the following signals which can be used in a trending or ranging market:
Trending Market
• Go long if a retracement records a negative number on %b (i.e. price has closed below the lower Bollinger Band) and is followed by a second retracement where %b remains positive.
• Go short if a rally records a value above 100 for %b (the upper Bollinger Band) and is followed by a second rally where %b remains below 100.
Use failure swings on Welles Wilder's Relative Strength Index to confirm the signals.
EXAMPLE
Goldman Sachs is displayed with 20-day Bollinger %b.
1. Go long [L] when a retracement on Bollinger %b respects the zero line after the previous retracement was below zero.
2. Exit [X] when a rally on Bollinger %b falls short of 100 after the previous rally exceeded 100.
3. Go long [L] when the retracement on Bollinger %b reverses while above zero after the previous retracement reached zero.
4. Exit [X] after another bearish divergence on Bollinger %b, from above to below 100.
Bollinger Band Width Indicator
Bollinger's Bandwith Indicator is used to warn of changes in volatility. As we know from using Bollinger Bands, a squeeze where the bands converge into a narrow neck often precedes a rapid rise in volatility. A Bollinger Band squeeze is highlighted by a fall in the Band Width indicator to below 2.0%. Bollinger claims that a drop below 2% on the S&P 500 has led to many spectacular moves, but warns that the market often starts with a fake move, in the wrong direction, before the real move commences.
EXAMPLE
Goldman Sachs is displayed with 20-day Bollinger Band Width.
1. Go long [L] when Bollinger Band Width starts to rise after contracting to a historic low.
Bollinger requires contractions below 2.0%, but wider contractions provide perfectly adequate signals.
Bollinger %b Setup
The default setting for Bollinger %b and Band Width is a 20-Day simple moving average with bands drawn at 2 standard deviations.
See Indicator Panel for directions on how to set up an indicator — and Edit Indicator Settings to change the settings.
Bollinger %b Formula
The forumula for Bollinger %b is (Closing Price - Lower Band) / (Upper Band - Lower Band).
The formula for Bollinger Band Width is (Upper Band - Lower Band) / Simple Moving Average for the same period.
文章翻譯由兄弟財經提供
本文來源：http://www.incrediblecharts.com/indicators/bollinger_percentage_b_band_width.php