Bollinger Band®

 

Bollinger Bands are a type of statistical chart characterizing the prices and volatility over time of a financial instrument or commodity, using a formulaic method propounded by John Bollinger in the s. Financial traders employ these charts as a methodical tool to inform trading decisions.

A sell signal is generated when the security reaches the upper band whereas a buy signal is generated at the lower band. However, since those are leading and not lagging signals, they are not always played out. Upon selecting Bollinger Bands, the default setting will appear in the parameters window 20,2. Momentum oscillators work much the same way. BB 20, 2 Lower Band Penetrated.

SharpCharts Calculation

Bollinger Bands consist of a middle band with two outer bands. The middle band is a simple moving average that is usually set at 20 periods. A simple moving average is used because the standard deviation formula also uses a simple moving average.

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