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

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slug: /en/sql-reference/aggregate-functions/reference/varpop
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# varPop(x)

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`.

Alias: `VAR_POP`.

:::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.
:::
Removed /ja folder, cleaned up /ru markdown 2022-04-09 13:29:05 +00:00			`---`
add slugs 2022-08-28 14:53:34 +00:00			`slug: /en/sql-reference/aggregate-functions/reference/varpop`
Removed /ja folder, cleaned up /ru markdown 2022-04-09 13:29:05 +00:00			`sidebar_position: 32`
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Remove H1 anchor tags from docs 2022-06-02 10:55:18 +00:00			`# varPop(x)`
Removed /ja folder, cleaned up /ru markdown 2022-04-09 13:29:05 +00:00
			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`.

Add STD alias to stddevPop function for MySQL compatibility 2023-09-07 03:46:27 +00:00			Alias: `VAR_POP`.

			`:::note`
Removed /ja folder, cleaned up /ru markdown 2022-04-09 13:29:05 +00:00			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.
			`:::`