Bitcoin / US Dollar Perpetual Inverse Swap ContractBitMEX
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This is just a Bollinger band indicator that uses the highs & lows in addition to the close in the calculation of volatility / deviations from average. These bands will be slightly wider than regular Bollingers as a result.
I've found it useful with very short lookback lengths (3 to 5) for identifying periods when the bands are contracted... usually leads to an expansion of volatilty, so good for scalps.