# 99th percentile and 95th percentile aggregation of response time is always coming higher than normal aggregation for the response time

**URL:** <https://discuss.elastic.co/t/99th-percentile-and-95th-percentile-aggregation-of-response-time-is-always-coming-higher-than-normal-aggregation-for-the-response-time/119212>\
**Category:** Elasticsearch\
**Created:** [February 9, 2018, 10:24am UTC](https://discuss.elastic.co/t/99th-percentile-and-95th-percentile-aggregation-of-response-time-is-always-coming-higher-than-normal-aggregation-for-the-response-time/119212 "2018-02-09T10:24:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![vinayak](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vinayak/32/45342_2.png) [@vinayak](https://discuss.elastic.co/u/vinayak)\
**Post date:** [February 9, 2018, 10:24am UTC](https://discuss.elastic.co/t/99th-percentile-and-95th-percentile-aggregation-of-response-time-is-always-coming-higher-than-normal-aggregation-for-the-response-time/119212/1 "2018-02-09T10:24:44Z")

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As elastic search is calculating percentile using T-digest but every time the 95th and 99th percentile is coming higher than normal aggregation so i want to know that:

(a) is it possible that 99 or 95th percentile will be greater from normal aggregation calculation on all set of data?

(b) are we calculating percentile after sorting the actual data sets?Actually i want to know the exact working of T-digest so that i can figure it out that how it is doing calculation of percentile?

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 9, 2018, 10:24am UTC](https://discuss.elastic.co/t/99th-percentile-and-95th-percentile-aggregation-of-response-time-is-always-coming-higher-than-normal-aggregation-for-the-response-time/119212/2 "2018-03-09T10:24:44Z")

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