DMI/ADX - Directional Movement Index

DMI determines trend direction and strength.

calcDMI

Signature

calcDMI(data: OHLCV[], options?: DMIOptions): DMIResult[]

Parameters

interface DMIOptions {
  period?: number;     // Period, default 14
  adxPeriod?: number;  // ADX smoothing period
}

Return Type

interface DMIResult {
  pdi: number | null;   // +DI (Plus Directional Indicator)
  mdi: number | null;   // -DI (Minus Directional Indicator)
  adx: number | null;   // ADX (Average Directional Index)
  adxr: number | null;  // ADXR (ADX Rating)
}

Components

• +DI: Measures upward momentum
• -DI: Measures downward momentum
• ADX: Measures trend strength (regardless of direction)
• ADXR: Smoothed ADX

Example

import { calcDMI } from 'stock-sdk';

const klines = await sdk.getHistoryKline('sz000001');
const dmi = calcDMI(klines, { period: 14 });
console.log(dmi[30].pdi);  // +DI
console.log(dmi[30].mdi);  // -DI
console.log(dmi[30].adx);  // ADX

Usage Tips

• +DI > -DI: Uptrend
• -DI > +DI: Downtrend
• ADX > 25: Strong trend
• ADX < 20: Sideways/ranging market
• +DI/-DI crossover: Trend change signal