# covariance

> English word · Noun · IPA /kəʊˈvɛː.ɹi.əns/ · frequency rank #49,266

## Definitions
1. A statistical measure defined as scriptstyle operatorname Cov(X,Y)= operatorname E((X-μ)(Y-ν)) given two real-valued random variables X and Y, with expected values scriptstyle E(X),=,μ and scriptstyle E(Y),=,ν.
2. The conversion of data types from wider to narrower in certain situations.

## Etymology
From co- + variance.

## Common misspellings (15)
`ccovariance`, `coavriance`, `covairance`, `covaraince`, `covariacne`, `covariancce`, `covarianec`, `covariannce`, `covarience`, `covarinace`, `covarriance`, `covraiance`, `covvariance`, `cvoariance`, `ocvariance`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/covariance