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Directional Movement Index (DMI)

The Directional Movement Index (DMI) is a trend indicator that consists of two lines: +DI and -DI. Optionally, the Average Directional Index (ADX) can be included to measure trend strength.

Lines

  • +DI: Smoothed positive directional movement
  • -DI: Smoothed negative directional movement
  • ADX (optional): Average Directional Index, measures trend strength

Parameters

  • period (default: 14): Period for smoothing
  • withADX (default: false): Whether to calculate ADX as well

Usage Example

import { DMI } from '../src/dmi';

const dmi = new DMI();
const result = dmi.nextValue(high, low, close);
// result: { plusDI, minusDI } or { plusDI, minusDI, adx }

Returns

An object with the following properties:

  • plusDI: Positive Directional Indicator (+DI)
  • minusDI: Negative Directional Indicator (-DI)
  • adx: Average Directional Index (if withADX is true)