ClickHouse/docs/en/sql-reference/aggregate-functions/reference/stddevpop.md

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# stddevPop {#stddevpop}

The result is equal to the square root of [varPop](../../../sql-reference/aggregate-functions/reference/varpop.md).

!!! note "Note"
    This function uses a numerically unstable algorithm. If you need [numerical stability](https://en.wikipedia.org/wiki/Numerical_stability) in calculations, use the `stddevPopStable` function. It works slower but provides a lower computational error.
[docs] split aggregate function and system table references (#11742) * prefer relative links from root * wip * split aggregate function reference * split system tables 2020-06-18 08:24:31 +00:00			`---`
			`toc_priority: 30`
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			`# stddevPop {#stddevpop}`

[docs] split various kinds of CREATE queries into separate articles (#12328) * normalize * split & adjust links * re-normalize * adjust ru links * adjust ja/tr links * partially apply e0d19d2aeaeafa3620305bce3a991fefc0e28695 * reset contribs 2020-07-09 15:10:35 +00:00			`The result is equal to the square root of [varPop](../../../sql-reference/aggregate-functions/reference/varpop.md).`
[docs] split aggregate function and system table references (#11742) * prefer relative links from root * wip * split aggregate function reference * split system tables 2020-06-18 08:24:31 +00:00
			`!!! note "Note"`
			This function uses a numerically unstable algorithm. If you need [numerical stability](https://en.wikipedia.org/wiki/Numerical_stability) in calculations, use the `stddevPopStable` function. It works slower but provides a lower computational error.