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 Bollinger Band (BB) are a kind of envelope.

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Join date : 2011-04-13

PostSubject: Bollinger Band (BB) are a kind of envelope.   Wed Aug 24, 2011 12:07 am

A Bollinger band technical indicator looks similar to the moving average envelope, but differs in how the outer bands are created.

The only difference is that the bands of MA Envelopes are plotted a fixed distance (%) away from the moving average, while the BB‘s are plotted a certain number of standard deviations away from it.

Because standard deviation is a measure of volatility, Bollinger bands adjust themselves to the market conditions. More about Bollinger Band envelope >>>
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