John Bollinger - Sharpen Your Trading Skills
The Bollinger Bands – B-Bands
The Bollinger Bands (B-Bands) technical study was created by John Bollinger, the president of Bollinger Capital Management Inc., based in Manhattan Beach, California. Bollinger is well respected in the futures and equities industries.
Traders generally use B-Bands to determine overbought and oversold zones, to confirm divergences between prices and other technical indicators, and to project price targets. The wider the B-bands on a chart, the greater the market volatility; the narrower the bands, the less market volatility.
B-Bands are lines plotted on a chart at an interval around a moving average. They consist of a moving average and two standard deviations charted as one line above and one line below the moving average. The line above is two standard deviations added to the moving average. The line below is two standard deviations subtracted from the moving average.
Some traders use B-Bands in conjunction with another indicator, such as the Relative Strength Index (RSI). If the market price touches the upper B-band and the RSI does not confirm the upward move (i.e. there is divergence between the indicators), a sell signal is generated. If the indicator confirms the upward move, no sell signal is generated, and in fact, a buy signal may be indicated.
If the price touches the lower B-band and the RSI does not confirm the downward move, a buy signal is generated. If the indicator confirms the downward move, no buy signal is generated, and in fact, a sell signal may be indicated.
Another strategy uses the Bollinger Bands without another indicator. In this approach, a chart top occurring above the upper band followed by a top below the upper band generates a sell signal. Likewise, a chart bottom occurring below the lower band followed by a bottom above the lower band generates a