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32 lines
1.3 KiB
Markdown
32 lines
1.3 KiB
Markdown
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# MINUS_DI: Minus Directional Indicator
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### TL;DR
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Measures downward directional movement strength as a percentage (0-100).
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## Introduction
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The Minus Directional Indicator (-DI) measures the strength of downward price movement relative to the true range. It is one of the components of the Directional Movement System developed by J. Welles Wilder Jr.
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When -DI is rising, downward price pressure is increasing. When -DI crosses above +DI, it signals a potential bearish trend. The -DI line is commonly plotted alongside +DI to visualize directional balance.
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## Calculation
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-DI = Smoothed(-DM) / Smoothed(TR) × 100
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Where:
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- -DM (Minus Directional Movement) = max(PrevLow - Low, 0) when PrevLow - Low > High - PrevHigh, else 0
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- TR (True Range) = max(High - Low, |High - PrevClose|, |Low - PrevClose|)
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- Smoothing uses Wilder's method: Smooth = Smooth - Smooth/N + Input
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## Parameters
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| Parameter | Default | Range | Description |
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| :--- | :--- | :--- | :--- |
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| Period | 14 | 2-∞ | Wilder smoothing period |
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## Interpretation
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- **Rising -DI:** Strengthening downward movement
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- **-DI > +DI:** Bears dominate; potential downtrend
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- **-DI crossover above +DI:** Bearish signal
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- **High -DI (>40):** Strong downward momentum
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## References
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- Wilder, J. Welles Jr. "New Concepts in Technical Trading Systems" (1978)
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