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

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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 in calculations, use the covarPopStable function. It works slower but provides a lower computational error. :::