Developed by John Bollinger, this technique is one of the most popular
forms of envelope or channel indicator. Two winding parallel lines
above and below a central moving average (MA) create a band that
contains the majority of price movements within a channel. This is
similar to moving average envelopes. The difference is that Bollinger
Bands are also sensitive to volatility in the market. The bands spread
further apart during volatile markets and come closer together during
calmer markets.
Read full report: http://www.chartfilter.com/reports/c7.htm

Bollinger Bands, Envelopes and Channels -
http://www.chartfilter.com/newsletter/newsletter3.htm

Screening Bollinger Bands and MACD - http://www.chartfilter.com/screenernewsletter/nl6.htm

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