---
title: covariance() function
description: covariance() computes the covariance between two columns.
url: https://docs.influxdata.com/flux/v0/stdlib/universe/covariance/
estimated_tokens: 986
product: Flux
version: v0
---

# covariance() function

-   Flux 0.7.0+
-   View InfluxDB support

`covariance()` computes the covariance between two columns.

##### Function type signature

```js
(<-tables: stream[A], columns: [string], ?pearsonr: bool, ?valueDst: string) => stream[B] where A: Record, B: Record
```

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### columns

(Required) List of two columns to operate on.

### pearsonr

Normalize results to the Pearson R coefficient. Default is `false`.

### valueDst

Column to store the result in. Default is `_value`.

### tables

Input data. Default is piped-forward data (`<-`).

## Examples

### Calculate the covariance between two columns

```js
data
    |> covariance(columns: ["x", "y"])
```

[](#view-example-input-and-output)

View example input and output

#### Input data

| _time | x | y |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | 0 | 0 |
| 2021-01-01T00:00:12Z | 1 | 0.5 |
| 2021-01-01T00:00:24Z | 4 | 8 |
| 2021-01-01T00:00:36Z | 9 | 40.5 |
| 2021-01-01T00:00:48Z | 16 | 128 |

#### Output data

| _value |
| --- |
| 345.75 |

#### Related

-   [cov() function](/flux/v0/stdlib/universe/cov/)

[transformations](/flux/v0/tags/transformations/) [aggregates](/flux/v0/tags/aggregates/)