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-<!--
-title: "Percentile"
-sidebar_label: "Percentile"
-description: "Use percentile in API queries and health entities to find the 'percentile' 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/percentile/README.md
-learn_status: "Published"
-learn_topic_type: "References"
-learn_rel_path: "Developers/Web/Api/Queries"
--->
-
-# Percentile
-
-The percentile is the average value of a series using only the smaller N percentile of the values.
-(a population or a probability distribution).
-
-Netdata applies linear interpolation on the last point, if the percentile requested does not give a round number of
-points.
-
-The following percentile aliases are defined:
-
-- `percentile25`
-- `percentile50`
-- `percentile75`
-- `percentile80`
-- `percentile90`
-- `percentile95`
-- `percentile97`
-- `percentile98`
-- `percentile99`
-
-The default `percentile` is an alias for `percentile95`.
-Any percentile 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: percentile95 -1m unaligned of my_dimension
-  warn: $this > 1000
-```
-
-`percentile` 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=percentile` in the URL and the additional parameter `group_options`
-may be used to request any percentile (e.g. `&group=percentile&group_options=96`).
-
-## 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=percentile95&after=-60&label=percentile95&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/Percentile>.