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ADX and DI by MiG

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This Pine Script calculates and plots the ADX (Average Directional Index) and its components, DI+ and DI-, which are part of the Directional Movement Index (DMI) system. The indicator helps traders assess trend strength and direction.

len: the period used for smoothing calculations (default 14).
th: threshold line for ADX (default 20) to visually indicate weak vs. strong trends.
True Range (TR): Measures the most extreme price movement between consecutive bars.

Directional Movement Plus (DM+): Measures upward movement; non-zero only if the current high is higher than the previous high and exceeds downward movement.

Directional Movement Minus (DM-): Measures downward movement; non-zero only if the current low is lower than the previous low and exceeds upward movement.

• DIPlus and DIMinus are the smoothed Directional Indicators (percentage form).
• DX measures the relative difference between DI+ and DI- as a percentage.
• ADX is the smoothed average of DX, representing trend strength:
• ADX > threshold → strong trend
• ADX < threshold → weak or no trend

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