The Bollinger Bandwidth® study is a technical indicator based upon Bollinger Bands® study, expressing the distance between upper and lower bands as percentage of the middle band value (moving average around which the bands are plotted). The main plot is accompanied with two additional ones: Bulge and Squeeze. Bulge plot displays the highest bandwidth value reached on the specified period, and, similarly, Squeeze plot shows the lowest bandwidth value.

Input Parameters

Parameter Description
average type The type of moving average to be used in calculations: simple, exponential, weighted, Wilder's, or Hull.
price The price used in calculations of the bands.
displace The number of bars to shift the bands forward or backward. Positive numbers signify a backward displacement.
length The number of bars used to calculate the Bollinger Bands® study.
num dev dn The number of deviations to plot the lower band.
num dev up The number of deviations to plot the upper band.
bulge length The number of bars in the period on which the highest bandwidth value is defined.
squeeze length The number of bars in the period on which the lowest bandwidth value is defined.


Plot Description
Bandwidth The Bollinger Bandwidth® plot.
Bulge The Bulge plot showing the highest bandwidth value.
Squeeze The Squeeze plot showing the lowest bandwidth value.

Bollinger Bands® is a registered trademark of John Bollinger.


*For illustrative purposes only. Not a recommendation of a specific security or investment strategy.

  Past performance is no guarantee of future performance.

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