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Average True Range (ATR)
A measure of volatility introduced by Welles Wilder in his book: New Concepts in Technical Trading Systems.
The True Range indicator is the greatest of the following:
-current high less the current low.
-the absolute value of the current high less the previous close.
-the absolute value of the current low less the previous close.
The Average True Range is a moving average (generally 14-days) of the True Ranges.
... Courtesy of Investopedia
double; Accessing this method via an index value [int barsAgo] returns the indicator value of the referenced bar.
You can view this indicator method source code by selecting the menu Tools > Edit NinjaScript > Indicator within the NinjaTrader Control Center window.