ClickHouse/docs/en/sql-reference/aggregate-functions/reference/corr.md

---
slug: /en/sql-reference/aggregate-functions/reference/corr
sidebar_position: 107
---

# corr

Syntax: `corr(x, y)`

Calculates the Pearson correlation coefficient: `Σ((x - x̅)(y - y̅)) / sqrt(Σ((x - x̅)^2) * Σ((y - y̅)^2))`.

:::note
This function uses a numerically unstable algorithm. If you need [numerical stability](https://en.wikipedia.org/wiki/Numerical_stability) in calculations, use the `corrStable` function. It works slower but provides a lower computational error.
:::
Removed /ja folder, cleaned up /ru markdown 2022-04-09 13:29:05 +00:00			`---`
add slugs 2022-08-28 14:53:34 +00:00			`slug: /en/sql-reference/aggregate-functions/reference/corr`
Removed /ja folder, cleaned up /ru markdown 2022-04-09 13:29:05 +00:00			`sidebar_position: 107`
			`---`

Remove H1 anchor tags from docs 2022-06-02 10:55:18 +00:00			`# corr`
Removed /ja folder, cleaned up /ru markdown 2022-04-09 13:29:05 +00:00
			Syntax: `corr(x, y)`

			Calculates the Pearson correlation coefficient: `Σ((x - x̅)(y - y̅)) / sqrt(Σ((x - x̅)^2) * Σ((y - y̅)^2))`.

Remove H1 anchor tags from docs 2022-06-02 10:55:18 +00:00			`:::note`
Removed /ja folder, cleaned up /ru markdown 2022-04-09 13:29:05 +00:00			This function uses a numerically unstable algorithm. If you need [numerical stability](https://en.wikipedia.org/wiki/Numerical_stability) in calculations, use the `corrStable` function. It works slower but provides a lower computational error.
			`:::`