KeltnerChannels

Is a volatility indicator.
Is computed using the closing price.
Returns three time series consisting of a 20-period exponential moving average of the closing price and bands that are two times the 10-period average true range above and below the moving average.
FinancialIndicator["KeltnerChannels", n1, n2, b] uses a period moving average and bands b times the -period average true range from the moving average.
The first values in the time series are computed using partial periods.
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