Zero Lag indicator is described in November 2010 issue of Stocks & Commodities.
The formula of the indicator is:
ZL = α * (EMA + Gain * (Close - ZL[1])) + (1 - α) * ZL[1]
The formula is similar to EMA, except that new term Gain * (Close - ZL[1]) is introduced.
'Gain' represents the value which is chosen from [-GainLimit, GainLimit] interval to minimize
the error for current data sample, (Close - ZL) → min
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