---
title: rolling
description: Learn the usage, parameters and practical details of the rolling function,
  a vital Python tool for calculating the rolling mean and standard deviation.
keywords:
- Rolling function
- Mean calculation
- Standard deviation
- Programming tools
- Window length parameter
- Usage example
- Data visualization
---

import HeadTitle from '@site/src/components/General/HeadTitle.tsx';

<HeadTitle title="crypto/qa/rolling - Reference | OpenBB Terminal Docs" />

Rolling mean and std deviation

### Usage

```python
rolling [-w N_WINDOW]
```

---

## Parameters

| Name | Description | Default | Optional | Choices |
| ---- | ----------- | ------- | -------- | ------- |
| n_window | Window length | 14 | True | range(5, 100) |

![rolling](https://user-images.githubusercontent.com/46355364/154308175-bb244d55-a6e0-4d6e-80f4-b3937dcd8ed4.png)

---