ClickHouse/docs/en/sql-reference/aggregate-functions/reference/covarpop.md
Ivan Blinkov 7170f3c534
[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 11:24:31 +03:00

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# covarPop {#covarpop}
Syntax: `covarPop(x, y)`
Calculates the value of `Σ((x - x̅)(y - y̅)) / n`.
!!! 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 `covarPopStable` function. It works slower but provides a lower computational error.