Bollinger Bands (Boll) indicators by calculating the price of the " standard deviation" , and then seek a " confidence interval" of the stock price. This indicator draw three lines on the graph, which the upper and lower two lines can be seen as price pressure line and support line between the two lines, there is a price average, Bollinger Bands indicator parameters best set to 20. In general, the stock will run in the pressure line and support line formed channel.

MT4技术指标源码_BOLL改进版.txt

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