# Sum N (SUM)

> QuantNexus indicator page for a rolling sum over the lookback window.

**Route**: `/quantnexus/indicators/sum/`

## What It Does

SUM adds up the last `period` price values into a running total.

## Formula

`SUM = price(t) + price(t-1) + ... + price(t-n+1)`

## Parameters

- `period` - default `14`

## C++23 API

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

## Common Usage

- Use it when you need a rolling aggregate instead of an average.
- Pair it with threshold logic or cumulative-flow style rules.
- Helpful for measuring total contribution over a fixed lookback.