# Minus Directional Indicator (MINUS_DI)

> QuantNexus indicator page for downside directional strength.

**Route**: `/quantnexus/indicators/minus-di/`

## What It Does

MINUS_DI measures the strength of downward directional movement over a rolling window.

## Formula

`-DI = smoothed negative directional movement / smoothed true range`

## Parameters

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

## C++23 API

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

## Common Usage

- Use it with `PLUS_DI` to assess directional bias.
- Confirm downtrend strength when `MINUS_DI` rises and dominates `PLUS_DI`.
- Pair it with trend filters instead of using it alone.