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

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sidebar_position: 32
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# varPop(x) {#varpopx}

Calculates the amount `Σ((x - x̅)^2) / n`, where `n` is the sample size and `x̅`is the average value of `x`.

In other words, dispersion for a set of values. Returns `Float64`.

:::note    
This function uses a numerically unstable algorithm. If you need [numerical stability](https://en.wikipedia.org/wiki/Numerical_stability) in calculations, use the `varPopStable` 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			`---`
Update /sql-reference docs 2022-03-30 04:06:21 +00:00			`sidebar_position: 32`
[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			`---`

			`# varPop(x) {#varpopx}`

			Calculates the amount `Σ((x - x̅)^2) / n`, where `n` is the sample size and `x̅`is the average value of `x`.

			In other words, dispersion for a set of values. Returns `Float64`.

Update /sql-reference docs 2022-03-30 04:06:21 +00:00			`:::note`
			This function uses a numerically unstable algorithm. If you need [numerical stability](https://en.wikipedia.org/wiki/Numerical_stability) in calculations, use the `varPopStable` function. It works slower but provides a lower computational error.
			`:::`