# Down Day Bool (DOWNDAYBOOL)

> QuantNexus indicator page for DOWNDAYBOOL.

**Route**: `/quantnexus/indicators/downdaybool/`

## What It Does

DOWNDAYBOOL returns a boolean-style result showing whether the current bar is a down day. It is a simple helper for rule logic.

## Formula

`Down Day Bool = true when Close < Previous Close`

## Parameters

- `period` - default `14`

## C++23 API

```cpp
#include <nonabt/indicators/downdaybool.hpp>
auto downdaybool = std::make_unique<nonabt::DOWNDAYBOOL>(data(), 14);
```

## Common Usage

- Use it as a filter for bearish days.
- Combine with trend or volume conditions.
- Good for quick count-based logic.

## Practical Pattern

DOWNDAYBOOL is most useful as a building block in custom multi-condition systems.