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-<!--
-title: "Trimmed Mean"
-sidebar_label: "Trimmed Mean"
-description: "Use trimmed-mean in API queries and health entities to find the average value from a sample, eliminating any unwanted spikes in the returned metrics."
-custom_edit_url: https://github.com/netdata/netdata/edit/master/web/api/queries/trimmed_mean/README.md
-learn_status: "Published"
-learn_topic_type: "References"
-learn_rel_path: "Developers/Web/Api/Queries"
--->
-
-# Trimmed Mean
-
-The trimmed mean is the average value of a series excluding the smallest and biggest points.
-
-Netdata applies linear interpolation on the last point, if the percentage requested to be excluded does not give a
-round number of points.
-
-The following percentile aliases are defined:
-
-- `trimmed-mean1`
-- `trimmed-mean2`
-- `trimmed-mean3`
-- `trimmed-mean5`
-- `trimmed-mean10`
-- `trimmed-mean15`
-- `trimmed-mean20`
-- `trimmed-mean25`
-
-The default `trimmed-mean` is an alias for `trimmed-mean5`.
-Any percentage may be requested using the `group_options` query parameter.
-
-## how to use
-
-Use it in alerts like this:
-
-```
- alarm: my_alert
-    on: my_chart
-lookup: trimmed-mean5 -1m unaligned of my_dimension
-  warn: $this > 1000
-```
-
-`trimmed-mean` does not change the units. For example, if the chart units is `requests/sec`, the result
-will be again expressed in the same units. 
-
-It can also be used in APIs and badges as `&group=trimmed-mean` in the URL and the additional parameter `group_options`
-may be used to request any percentage (e.g. `&group=trimmed-mean&group_options=29`).
-
-## Examples
-
-Examining last 1 minute `successful` web server responses:
-
--   ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=min&after=-60&label=min)
--   ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=average&after=-60&label=average)
--   ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=trimmed-mean5&after=-60&label=trimmed-mean5&value_color=orange)
--   ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max)
-
-## References
-
--   <https://en.wikipedia.org/wiki/Truncated_mean>.