# Directional Movement Index (DMI)

> QuantNexus indicator page for DMI.

**Route**: `/quantnexus/indicators/dmi/`

## What It Does

DMI compares directional movement to determine whether upward or downward trend pressure is stronger.

## Formula

DMI compares positive and negative directional movement components over a lookback period.

## Parameters

- `period` - default `14`
- `movav` - default `SmoothedMovingAverage`

## C++23 API

```cpp
#include <nonabt/indicators/dmi.hpp>
auto dmi = std::make_unique<nonabt::DMI>(data(), 14, "SmoothedMovingAverage");
```

## Common Usage

- Use DMI as a trend direction filter.
- Pair it with ADX for trend strength.
- Useful in breakout and trend-following systems.

## Practical Pattern

When positive directional movement dominates, the system tends to favor long-side confirmation.