> For the complete documentation index, see [llms.txt](https://docs.ladybug.tools/ladybug-primer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ladybug.tools/ladybug-primer/components/4_extra/time_rate_of_change.md).

# Time Rate of Change

![](https://894783789-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LPHXQ1I3gb93zpLrLZf%2Fuploads%2Fgit-blob-8a6e83a08e9e2534686652d8d4bdb9293e26aa99%2FTime_Rate_of_Change.png?alt=media)

![](https://894783789-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LPHXQ1I3gb93zpLrLZf%2Fuploads%2Fgit-blob-df3211da318bd9b7e98c0f59df092866e0c9c2e0%2FTime_Rate_of_Change.png?alt=media) - [\[source code\]](https://github.com/ladybug-tools/ladybug-grasshopper/blob/master/ladybug_grasshopper/src//LB%20Time%20Rate%20of%20Change.py)

Convert a DataCollection of time-aggregated values to time rate of change units.

For example, if the collection has an Energy data type in kWh, this method will return a collection with an Power data type in W.

### Inputs

* **data \[Required]**

A houry, sub-hourly or daily data collection that can converted to a time rate of change metric. (eg. a data collection of Energy values in kWh).

### Outputs

* **data\_rate**

The data collection converted to time rate of changevalues. (eg. a data collection of Energy values in kWh).