Average True Range (ATR) - Technical Analysis from A to Z
The Average True Range (ATR) is a measure of volatility. It was introduced by Welles Wilder in his book, New Concepts in Technical Trading Systems,
and has since been used as a component of many indicators and trading systems. Wilder has found that high ATR values often occur at market bottoms
following a "panic" sell-off. Low Average True Range values are often found during extended sideways periods,
such as those found at tops and after consolidation periods.