Channel indicator HWC (Holt-Winters Channel) based on HWMA - a three-parameter moving average calculated by the method of Holt-Winters.
It has six input parameters:
Calculations:
Top = HWMA + Multiplier * StDt Bottom = HWMA - Multiplier * StDt
where:
HWMA - Holt-Winter Moving Average
StDt[i] = Sqrt(Var[i-1]) Var[i] = (1-d) * Var[i-1] + nD * (Price[i-1] - HWMA[i-1]) * (Price[i-1] - HWMA[i-1])

Translated from Russian by MetaQuotes Ltd.
Original code: https://www.mql5.com/ru/code/20857
HWMA
Indicator HWMA (Holt-Winter Moving Average) is a three-parameter moving average by the Holt-Winter method.
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