The Average True Range indicator is defined by Wilder to be the greatest of the following for each period:

The Average True Range is simply the average of the true ranges over the past selected lookback period. It determines a security’s volatility over a given period. That is, the tendency of a financial instrument to move, in either direction. The value returned by the average true range is simply an indication as to how much a financial instrument has moved either up or down on average over the defined period. High values indicate that prices are changing a large amount during the day. Low values indicate that prices are staying relatively constant. Note that both trending and non-trending markets can have high or low volatility.

Select Indicator Aroon Average Directional Index Average True Range Bollinger Bands Bollinger Bandwidth Commodity Channel Index Exponential Moving Average MACD Momentum On Balance Volume Relative Strength Index r-squared Stochastic Oscillator Simple Moving Average Stop Loss Vertical Horizontal Filter Volume