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| Average Directional Index - ADX |
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An indicator used in technical analysis to determine the strength of a prevailing trend. The ADX is measured on a scale between zero and 100. Readings below 20 are used to indicate a weak trend, while readings over 40 indicate a strong trend. ADX is not used to determine the direction of a particular trend, but only to gauge its strength.
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Traders use a move above 20 to suggest the start of a new trend (either up or down) and a move below 40 to suggest that the current trend may be coming to an end. The ADX is a derivation of two separate indicators known as direction momentum indicators (+DI and -DI). Unlike the ADX, these direction momentum indicators can be used to gauge trend direction and are commonly plotted alongside the ADX.
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