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Average true range (ATR) is a technical analysis volatility indicator originally developed by J. Welles Wilder, Jr. for commodities. The indicator does not provide an indication of price trend, simply the degree of price volatility.〔(ATR Definition - investopedia.com )〕〔 〕 The average true range is an N-day smoothed moving average (SMMA) of the true range values. Wilder recommended a 14-period smoothing.〔This is by his reckoning of SMMA periods, meaning an α=1/14.〕 == Calculation == The range of a day's trading is simply . The true range extends it to yesterday's closing price if it was outside of today's range. : The true range is the largest of the: * Most recent period's high minus the most recent period's low * Absolute value of the most recent period's high minus the previous close * Absolute value of the most recent period's low minus the previous close The ATR at the moment of time ''t'' is calculated using the following formula:〔(Average True Range calculation )〕 (This is one form of an exponential moving average) : The first ATR value is calculated using the arithmetic mean formula: : The idea of ranges is that they show the commitment or enthusiasm of traders. Large or increasing ranges suggest traders prepared to continue to bid up or sell down a stock through the course of the day. Decreasing range suggests waning interest. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「average true range」の詳細全文を読む スポンサード リンク
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