COVARIANCE

covariance

(noun) (statistics) the mean value of the product of the deviations of two variates from their respective means

Source: WordNet® 3.1

Etymology

Noun

covariance (plural covariances)

(statistics) A statistical measure defined as $\backslash (\backslash scriptstyle\backslash operatorname\{Cov\}(X,\; Y)\; =\; \backslash operatorname\{E\}((X\; -\; \backslash mu)\; (Y\; -\; \backslash nu))\backslash )$ given two real-valued random variables X and Y, with expected values $\backslash (\backslash scriptstyle\; E(X)\backslash ,=\backslash ,\backslash mu\backslash )$ and $\backslash (\backslash scriptstyle\; E(Y)\backslash ,=\backslash ,\backslash nu\backslash )$.

(object-oriented programming) The conversion of data types from wider to narrower in certain situations.

Coordinate term: contravariance

Source: Wiktionary

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