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slug: /en/sql-reference/aggregate-functions/reference/covarpop
sidebar_position: 36
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# covarPop

Syntax: `covarPop(x, y)`

Calculates the value of `Σ((x - x̅)(y - y̅)) / n`.

:::note
This function uses a numerically unstable algorithm. If you need [numerical stability](https://en.wikipedia.org/wiki/Numerical_stability) in calculations, use the `covarPopStable` function. It works slower but provides a lower computational error.
:::