Bollinger BandWidth is an indicator derived from Bollinger his book, Bollinger on Bollinger Bands, John Bollinger refers to Bollinger BandWidth as one of two indicators that can be derived from Bollinger other indicator is %B. BandWidth measures the percentage difference between the upper band and the lower band.

Bollinger on Bollinger Bands provides tips, guidelines, and rules for incorporating the bands into virtually any investment strategy. Bollinger BandWidth is an indicator derived from Bollinger Bands. When price moves up, the bands spread apart.

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Bollinger Bands are intervals drawn on Hang Seng price chart at standard deviation levels above and below the corresponding moving average. This produces an effect of having the bands widen during periods of Hang Seng .

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