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S&P 500 Bollinger Bands

S&P 500 Index (SP:SPX)  
sunshinesailor  
SP:SPX   S&P 500 Index
Moving Averages Breadth Indicators
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movingaverage breadthstudies
S&P 500 Bollinger Bands

Bollinger Bands consist of three bands

They revolve around a centred simple moving average (SMA), with a default value of 20, of which 85% of the time, the price is held within the following boundaries:

Lower band – SMA (minus two standard deviations)

Upper band – SMA (plus two standard deviations)
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