covariance


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Related to covariance: Covariance matrix

covariance

 [ko-va´re-ans]
a measure of the tendency of two random variables to vary together. It is the expected value of the product of the deviations of corresponding values of two random variables from their respective means.

covariance

/co·var·i·ance/ (ko-vār´e-ins) a measure of the tendency of two random variables to vary together.

covariance

(kō-vā′rē-ăns)
In statistics, the expected value of the product of the deviations of corresponding values of two variables from their respective means.

covariance

the expected value of the product of the deviations of corresponding values of two random variables from their respective means.

covariance method
used for the calculation of relationship and inbreeding in large populations.
References in periodicals archive ?
Generally, the standard deviation in growth of a country will fall if some source of variation is removed; covariance between the growth rates of two countries will fall at the same time if some of the variation that is being removed is common variation.
The covariance between two population total estimators is defined by
Factor Covariance Invariance and Error Variance Invariance
Using the distribution theory relating to GMM estimates, the joint distribution of univariate test statistics is derived and, by allowing for the covariance between test statistics, a multivariate test of normality is conducted.
Since equation (1) holds for any positive integer n, Equation (3) must hold for any number of assets as well once the expected rate of return and their covariance existent or being given.
On the other hand, synchronization of interest rates is found to have a positive effect on all three covariance terms, the covariance of exchange rates and interest rate differentials, the covariance of exchange rates and relative movements in FX reserves, and the covariance of interest rate differentials and relative movements in FX reserves.
This indicates that the running simple animal model in which only direct additive genetic effect is taken into account, will lead to overestimation of the estimated direct heritability value; secondly, as shown in Table 3, consideration of covariance of maternal and direct additive genetic effect in the model resulted in a significant increase in the estimated value of log likelihood.
When trying to outline the work's rationale, the most evident rhetorical relationship has been the covariance causation, by which the authors have defended the necessity for a useful treatise and have offered, as a result, the motives for such dissertations.
According to this formula, the risk premium on any asset is a weighted average of two conditional covariances, the consumption covariance [[sigma].
This leads to a number of about 5000 daily observations within the covariance time series.
To enable a comparison of the properties of the estimates from an EM and a SM, it is helpful to partition the expected values of the parameter estimates and their covariance matrix from the EM as follows:
The structure underlying the responses on the AVL scale was evaluated using several techniques that are available through covariance structural modeling and latent variable modeling (Muthen, 2002; Raykov & Marcoulides, 2006).