GT::Indicators::TR - True Range
The True Range (TR) is designed to measure the volatility between two days.
The True Range is defined as the greatest of the following :
- The current high less the current low. - The absolute value of : current high less the previous close. - The absolute value of : current low less the previous close.
The TR is not directly validated but the ATR matches the data from comdirect.de.
http://www.stockcharts.com/education/What/IndicatorAnalysis/indic_ATR.html http://www.equis.com/free/taaz/avertrurang.html