co·var·i·ance (ko-vārґe-əns) [co- + variance] in statistics, a measure of the tendency of two random variables to vary together: the expected value of the product of the deviations of corresponding values of the variables from their respective means. It may be positive, with both variables increasing or decreasing together; negative, with one variable decreasing as the other increases; or zero, with one variable unaffected by changes in the other.

Medical dictionary. 2011.

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  • covariance — [ kovarjɑ̃s ] n. f. • 1921; de co et variance ♦ Math. Covariance de deux variables aléatoires : moyenne des produits de deux variables centrées sur leurs espérances mathématiques et servant à définir leur coefficient de corrélation. ● covariance… …   Encyclopédie Universelle

  • covariance — n. a statistical measure of the relationship of two variables, formed by multiplying the difference of each variable from its mean, both variables being measured at the same time, and averaging all such products. [WordNet 1.5 +PJC] …   The Collaborative International Dictionary of English

  • covariance — 1878, from covariant (1853), from CO (Cf. co ) + VARIANT (Cf. variant) …   Etymology dictionary

  • covariance — [kō′ver΄ē əns, kō′ver′ē əns] n. Statistics a measure of the relationship between two variables whose values are observed at the same time; specif., the average value of the product of the two variables diminished by the product of their average… …   English World dictionary

  • Covariance — This article is about the measure of linear relation between random variables. For other uses, see Covariance (disambiguation). In probability theory and statistics, covariance is a measure of how much two variables change together. Variance is a …   Wikipedia

  • Covariance — Pour le principe physique, voir Principe de covariance générale.  Ne pas confondre avec la covariance d un tenseur en algèbre ou en géométrie différentielle, ou d un foncteur en théorie des catégories. En théorie des probabilités et en… …   Wikipédia en Français

  • Covariance — A measure of the degree to which returns on two risky assets move in tandem. A positive covariance means that asset returns move together. A negative covariance means returns move inversely. One method of calculating covariance is by looking at… …   Investment dictionary

  • covariance — A measurement of the relationship between two variables. The arithmetic mean of the products of the deviations of corresponding values of two quantitative variables from their respective means. American Banker Glossary A statistical measure of… …   Financial and business terms

  • covariance — kovariacija statusas T sritis Standartizacija ir metrologija apibrėžtis Dviejų atsitiktinių kintamųjų dydžių tarpusavio priklausomybės matas, lygus jų verčių sandaugos statistiniam vidurkiui. atitikmenys: angl. covariance vok. Kovarianz, f rus.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • covariance — kovariantiškumas statusas T sritis fizika atitikmenys: angl. covariance vok. Kovarianz, f rus. ковариантность, f pranc. covariance, f …   Fizikos terminų žodynas

  • Covariance — A statistical measure of the degree to which random variables move together. The New York Times Financial Glossary * * *    A statistical term for the correlation of two variables multiplied by the individual standard deviation for each of the… …   Financial and business terms

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