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Clojure for Finance by Timothy Washington

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The Bollinger Bands

The Bollinger Band is another technical trading indicator. It provides a volatility range for a stock price. This is based on the standard deviation from a price's mean. The standard deviation changes as volatility increases and decreases. This translates to a widening of the band when volatility increases and a narrowing of the band when volatility decreases. You can read more about Bollinger Bands at https://en.wikipedia.org/wiki/Bollinger_Bands and http://www.investopedia.com/terms/b/bollingerbands.asp.

The Bollinger Band has upper, lower, and middle bands. For us, the middle band will be the SMA. The upper and lower bands will be two standard deviations from the mean. The standard deviation is the square root of a variance. ...

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