
/>Bollinger Bands consist of a chart of three curves drawn in relation to currency pairs prices. The band situated in the middle is a measure of the intermediate-term trend and is usually a simple moving average, that serves as the base for the upper and lower bands. The interval between the upper, lower and the middle bands is determined by the volatility of the market, typically the standard deviation of the same data that were used for the moving average. The default parameter is 20 periods and two standard deviations above and below the middle band; of course this may be adjusted to suit your needs.
In short, the purpose of Bollinger Bands is to provide a relative definition of high and low price. By definition prices are considered high when touching the upper band and low when they touch the lower band. This relative definition can be used by the Forex trader to compare price actions and as a very useful indicator when the purpose of the trader is to arrive at rigorous buy and sell decisions.
About the author:
Adrian Pablo is a Forex freelance writer with articles published in a number of places. Get a free report on Fibonacci Trading and learn more about the world of trading , visit:
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Written By: Adrian Pablo

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