---
title: lowestAverage() function
description: >
  `lowestAverage()` calculates the average of each input table and returns the lowest
  `n` averages.
menu:
  flux_v0_ref:
    name: lowestAverage
    parent: universe
    identifier: universe/lowestAverage
weight: 101
flux/v0/tags: [transformations, selectors]
introduced: 0.7.0
---

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`lowestAverage()` calculates the average of each input table and returns the lowest
`n` averages.

**Note:** `lowestAverage()` drops empty tables.

##### Function type signature

```js
(<-tables: stream[A], n: int, ?column: string, ?groupColumns: [string]) => stream[B] where A: Record, B: Record
```

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

## Parameters

### n
({{< req >}})
Number of records to return.



### column

Column to evaluate. Default is `_value`.



### groupColumns

List of columns to group by. Default is `[]`.



### tables

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




## Examples

### Return the lowest table average from a stream of tables

```js
import "sampledata"

sampledata.int()
    |> lowestAverage(n: 1, groupColumns: ["tag"])

```

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{{% expand "View example input and output" %}}

#### Input data

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | -2      | t1   |
| 2021-01-01T00:00:10Z | 10      | t1   |
| 2021-01-01T00:00:20Z | 7       | t1   |
| 2021-01-01T00:00:30Z | 17      | t1   |
| 2021-01-01T00:00:40Z | 15      | t1   |
| 2021-01-01T00:00:50Z | 4       | t1   |

| _time                | _value  | *tag |
| -------------------- | ------- | ---- |
| 2021-01-01T00:00:00Z | 19      | t2   |
| 2021-01-01T00:00:10Z | 4       | t2   |
| 2021-01-01T00:00:20Z | -3      | t2   |
| 2021-01-01T00:00:30Z | 19      | t2   |
| 2021-01-01T00:00:40Z | 13      | t2   |
| 2021-01-01T00:00:50Z | 1       | t2   |


#### Output data

| tag  | _value  |
| ---- | ------- |
| t1   | 8.5     |

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