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