covariance

EnglishEdit

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NounEdit

covariance (plural covariances)

1. (statistics) A statistical measure defined as ${\displaystyle \scriptstyle \operatorname {Cov} (X,Y)=\operatorname {E} ((X-\mu )(Y-\nu ))}$  given two real-valued random variables X and Y, with expected values ${\displaystyle \scriptstyle E(X)\,=\,\mu }$  and ${\displaystyle \scriptstyle E(Y)\,=\,\nu }$ .
2. (object-oriented programming) The conversion of data types from wider to narrower in certain situations.

FrenchEdit

NounEdit

covariance f (plural covariances)

1. (statistics) covariance
2. (object-oriented programming) covariance