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Bollinger Bands Introduction:
Bollinger Bands are a technical trading tool created by John Bollinger in the early 1980s. They arose
from the need for adaptive trading bands and the observation that volatility was dynamic, not static as
was widely believed at the time.
The purpose of Bollinger Bands is to provide a relative definition of high and low. By definition prices are high at the upper band and low at the lower band. This definition can aid in rigorous pattern recognition and is useful in comparing price action to the action of indicators to arrive at systematic trading decisions. Bollinger Bands consist of a set of three curves drawn in relation to securities prices. The middle band is a measure of the intermediate-term trend, usually a simple moving average, that serves as the base for the upper band and lower band. The interval between the upper and lower bands and the middle band is determined by volatility, typically the standard deviation of the same data that were used for the average. The default parameters, 20 periods and two standard deviations, may be adjusted to suit your purposes. 
See Bollinger Bands in action at www.BollingerOnBollingerBands.com. Get the 22 Bollinger Band rules  Learn how to use Bollinger Bands:Bollinger On Bollinger Bands" book by John Bollinger, CFA, CMT |
John Bollinger's Monthly
Capital Growth Letter Analysis and commentary on the markets plus investment recommendations by John Bollinger.
January 2012 Excerpt
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If there was any doubt that the bull market in precious metals was at an end, the recent breakdown in gold should remove it. Simply put, the bullish scenario was for a high-level consolidation and any chance of that has been eliminated. The stocks are in the process of confirming the weakness in the bullion and other precious metals. Avoid for all but for a core insurance position or two at the most.
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