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Average True Range

technical analysis
Definition
A volatility indicator that measures the average range of price movement over a specified period, accounting for gaps.

Explanation

ATR was developed by J. Welles Wilder Jr. in 1978. Unlike simple range (high minus low), ATR accounts for overnight gaps by using the true range — the greatest of: current high minus current low, absolute value of current high minus previous close, or absolute value of current low minus previous close. ATR is commonly used for position sizing (risking a fixed percentage of the portfolio per ATR unit) and setting stop-loss levels.

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