# Double Exponential Moving Average (DEMA)

> QuantNexus indicator page for the DEMA fast moving average line.

**Route**: `/quantnexus/indicators/dema/`

## What It Does

DEMA reduces lag compared with a standard EMA by combining two EMA passes into one output line. It is useful for smoother trend tracking with less delay.

## Formula

`DEMA = 2 * EMA(price) - EMA(EMA(price))`

## Parameters

- `period` - default `30`
- `_movav` - default `EMA`

## C++23 API

```cpp
#include <nonabt/indicators/dema.hpp>
auto dema = std::make_unique<nonabt::DEMA>(data().close(), 30, "EMA");
```

## Common Usage

- Use DEMA for faster-moving trend filters.
- Combine it with price crossovers or another slower average.
- Good for systems that want less lag than SMA or EMA.

## Practical Pattern

Buy when price reclaims DEMA and sell when price loses it, or combine DEMA with a slower moving average for crossover logic.