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BOLLINGER BANDS
Bollinger bands are a technical trading tool developed by John Bollinger in the early 1980s. Bollinger Bands are volatility bands placed above and below a moving average. Volatility is based on the standard deviation, which changes as volatility increases and decreases.
Bollinger Bands consist of a middle band with two outer bands: The middle band is a simple moving average.
Bollinger Bands are volatility bands placed above and below a moving average.
The outer bands are usually set 2 standard deviations above and below the middle band. Breakout of Bollinger bands signals a possible correction at the market.
Many traders use Bollinger Bands as a trading signal to determine overbought and oversold levels, selling when price touches the upper band and buying when it hits the lower line.
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