covariance

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Related to Co-variance: Covariance matrix

covariance

[kō′ver·ē·əns]
(statistics)
A measurement of the tendency of two random variables, X and Y, to vary together, given by the expected value of the variable (X-X [OB ])(Y-Y [OB ]), where X [OB ] and Y [OB ] are the expected values of the variables X and Y respectively.
References in periodicals archive ?
Unlike co-variance, correlation coefficient is not expressed through units of a measurement [8].
As we have stressed, GDP volatility will be determined not only by the variances of each of its component sectors discussed in the previous section, but also by changes in the share of each sector in total GDP and the co-variance between sectors.
Next, we estimate re-insurance supply and demand curves explicitly in order to examine a critical prediction of the financial imperfection models: that intermediary hurdle rates reflect the co-variance of a particular cat risk with the intermediary's preexisting portfolio.
But it seems more perspicuous to stick with the core idea of supervenience as co-variance, and regard such co-variance as invariably a symptom of some other, more fundamental, relation of dependency or determination (identity, entailment, constitution, etc.
This result is true both when the conditional co-variances of individual asset returns are constant over time, and when they are allowed to vary as a function of economic variables.
Direct and maternal co-variance components and heritability estimates for body weight at different ages and fleece traits in Afrino Sheep.
Harvey, "The World Price of Co-variance Risk," Journal of Finance 46 (1991), pp.
Environmental co-variances between these two traits were also similar except that environmental co-variance from Model 1 was somewhat less than those from the other three models.
Phenotypic and genetic co-variance structure in milkweed bug life history traits.