Directional Indicator (+DI) (PLUS_DI)

Author
J. Welles Wilder

Reference
Book New Concepts in Technical Trading Systems [Amazon.com]
by J. Welles Wilder; Trend Research. ISBN:0894590278

Interpretation / Algorithm
Directional Movement with Metastock screenshot [paritech.com]
Description with math formula [FMLabs.com]
Technical Analysis Studies [prophet.net]

Product Implementation	Function / Formula / Script / Source Code
Genius Trader [geniustrader.org]	PERL Script - GT::Indicators::ADX [geniustrader.org]
TA-Lib [ta-lib.org]	C/C++ Source Code - TA_PLUS_DI()
Wealth-Lab [wealth-lab.com]	ChartScripts using DIPlus [wealth-lab.com]