Free Robot EA Bollinger Bands MT4 by Tatiana Savkevych
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Bollinger Bands (BB) are similar to Envelopes. The difference between them is that the boundaries of the Trade Bands (Envelopes) are located above and below the moving average curve at a fixed percentage distance, while the Bollinger Bands are plotted at distances equal to a certain number of standard deviations. Since the magnitude of the standard deviation depends on volatility, the bands themselves adjust their width: it increases when the market is unstable, and decreases in more stable per

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