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Bollinger Band

   Also found in: Wikipedia 0.04 sec.
Bollinger Band
A band plotted two standard deviations away from a simple moving average.



Above is an example of bollinger bands, the price of the stock is banded by an upper and lower band along with a 20-day simple moving average.

Notes:
Because standard deviation is a measure of volatility, Bollinger Bands adjust themselves to the market conditions. When the markets become more volatile the bands widen (move further away from the average), and, during less volatile periods, the bands contract (move closer to the average).

This is among one of the most popular technical analysis techniques. The closer the prices move to the upper band, the more overbought the market, and the closer the prices move to the lower band, the more oversold the market.


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Areas such as On Balance Volume, Bollinger Bands, Market Breadth Analysis, Parabolic Stops are covered as well as sections on Optimisation and Scanning.
Computer network maker F5 Networks (NASDAQ:FFIV) is riding its upper Bollinger band higher.
The S&P continues to hover near the lower Bollinger band, which is now at 1143.
 
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