Bollinger Bands®: What They Are, and What They Tell Investors

As the period is shortened or lengthened, the coverage changes, which affects the analysis efficiency. To maintain coverage at 88-89%, Bollinger Bands should be plotted using a 1.9 ratio for a 10-bar period. With a period of 50 bars, respectively, you need to increase the width from 2.0 to 2.1. To sum up, Bollinger Bands …

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