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Reference.org
Average directional movement index
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<p>The average directional movement index (ADX) was developed in 1978 by <a href="/facts/J._Welles_Wilder/oPSqPwAS">J. Welles Wilder</a> as an <a href="/facts/Technical_indicator/pnJj7DUo">indicator</a> of trend strength in a series of prices of a financial instrument. ADX has become a widely used indicator for technical analysts, and is provided as a standard in collections of indicators offered by various trading platforms. </p>