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PLUS_DM: Plus Directional Movement

Wilder-smoothed upward directional movement in price units (≥0).

Introduction

Plus Directional Movement (+DM) measures the magnitude of upward price movement, smoothed using Wilder's method. Unlike +DI which normalizes by true range to produce a percentage, +DM outputs raw smoothed values in price units.

+DM captures when the current bar's high exceeds the previous bar's high by more than the previous bar's low exceeds the current bar's low. It is the raw building block of the Directional Movement System.

Calculation

+DM = max(High - PrevHigh, 0) when High - PrevHigh > PrevLow - Low, else 0

Smoothed using Wilder's method: Smooth = Smooth - Smooth/N + Input

Parameters

Parameter	Default	Range	Description
Period	14	2-∞	Wilder smoothing period

Interpretation

Rising +DM: Increasing upward price extension
+DM > -DM: Upward movement exceeds downward movement
Zero +DM: No upward directional movement on the bar
Values are in price units and scale with the instrument

References

Wilder, J. Welles Jr. "New Concepts in Technical Trading Systems" (1978)

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