# Periodic aggregate

Periodic aggregates are similar to Rolling aggregates except that they downsample the data.

* If you have daily data and perform a Rolling aggregate using a window of one week with an average function, your chart will return a series with one point per day, with each point representing the previous week’s average.
* However, if you do a Periodic aggregate with a window of one week, your new series will have one point per week rather than one point per day.

## Input type

Time series

## Output type

Time series

## Examples

![Periodic aggregate example](../../../assets/037f40522d41a98d3bbe7d52c281303751c1b965207088db73a7a3a683e92c03.webp)

## Usage information

| Functionality | Availability |
| --- | --- |
| [Standard Quiver card](../core-concepts/index.md#cards) | Supported |
| [Transform table transform](../cards-transform-table/index.md) | Supported |

## See also

[Rolling aggregate](../card-rolling-aggregate/index.md)