What is the Average Directional Index?

The Average Directional Index (ADX) is a technical indicator used in financial markets to evaluate the strength and potential continuation of a price trend. Developed by J. Welles Wilder, the ADX is part of the broader family of indicators known as the Directional Movement Index (DMI).

Here are the key points about the Average Directional Index:


    • The ADX is derived from the components of the DMI, specifically the Positive Directional Index (+DI) and Negative Directional Index (-DI).
    • The ADX itself is calculated based on the smoothed averages of the +DI and -DI values.


    • Positive Directional Index (+DI): Measures the strength of upward price movement.
    • Negative Directional Index (-DI): Measures the strength of downward price movement.
    • Average Directional Index (ADX): This represents the overall strength of the trend, combining both upward and downward movement.


    • ADX values range from 0 to 100.
    • A high ADX value indicates a strong trend, while a low ADX suggests a weak or non-existent trend.
    • Levels above 25 are often considered to indicate a trending market, while levels below 20 may suggest a lack of trend.


    • Trend Strength: Traders use ADX to determine the strength of a prevailing trend.
    • Trend Direction: The +DI and -DI components help identify the direction of the trend.
    • Potential Reversals: Changes in the ADX level can signal potential reversals or weakening trends.


    • ADX does not provide information about the direction of the trend, only its strength.
    • It is typically used in conjunction with other indicators to make more informed trading decisions.
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