The band width breakout is a typical pattern that is observed when a market shifts from non-trending to trending.

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The band width might have saved those looking for a trending market, as it stayed below 2.5 from March through August.

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Band width finally broke out to the upside on September 7 after SLV had closed for three consecutive days above the Bollinger bands.

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The blue lines on the chart above represent the Bollinger bands, and below the bar chart, I have plotted the band width indicator.

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False breakouts in a trading range can often be identified through analysis of the band width, allowing us to use trading range strategies without getting whipsawed.

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On June 18th, despite Mr Meridor, Israel doubled the width of the band in which the shekel can trade against other currencies.

ECONOMIST: Exchange rates

The width of the band can be exploited, allowing scope for interest rates to be used to curb inflation but not the unlimited scope that central banks have at present.

ECONOMIST: Off target