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 n₁ moving average and bands b times the n₂-period average true range from the moving average. The first n₁ values in the time series are computed using partial periods.