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Automated-Trading 2010.07.14 16:19 

BB 3sigma:

Bollinger Bands +-3sigma. You can change period and sigma ratio (Proper size of Deviation is 0.5~1.0).

Bollinger Bands Indicator (BB) is similar to Envelopes. The only difference is that the bands of Envelopes are plotted a fixed distance (%) away from the moving average, while the Bollinger Bands are plotted a certain number of standard deviations away from it. Standard deviation is a measure of volatility, therefore Bollinger Bands adjust themselves to the market conditions. When the markets become more volatile, the bands widen and they contract during less volatile periods.

Author: imchurch

BB 3sigma

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