Calculating the DMI Indicator and Interpreting Its Trend Signals

Summary

This tutorial explains the Directional Movement Index (DMI), including its four lines: positive and negative directional indicators (DI+ and DI−), ADX, and ADXR. It describes an implementation assembled from directional indicator series, a smoothed directional index, and an average comparing current ADX with an earlier value. The author says plotted values were checked against another charting source and were broadly consistent, with small rounding differences.

The article interprets DI+ and DI− as relative directional pressure, while ADX and ADXR describe trend strength and changes. It gives heuristic setups for possible bottoms and tops using low directional readings alongside elevated, turning ADX and an ADX/ADXR crossover. A bullish trend-start setup combines tightly grouped low readings with a strong, high-volume candle and subsequent DI+ crossings. These are described as possible signals, not guaranteed reversals or validated trading results; the article offers no systematic backtest, and the calculation and thresholds may need verification in a chosen data library and market.

Key ideas

• DMI combines DI+, DI−, ADX, and ADXR to describe directional pressure and trend conditions.
• The tutorial constructs ADX from the separation of DI+ and DI−, then derives ADXR by comparing ADX values across time.
• Close DI+ and DI− readings are presented as a sign of consolidation, while widening separation suggests stronger direction.
• The proposed turning-point and trend-start patterns are heuristics that require independent validation.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.