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A statistical measure of the tendency of two random variables to vary in the same direction (called positive covariance) or in an opposite direction (called negative covariance) over many observations. Covariance is equal to the summed products of the deviations of corresponding values of the two variables from their respective means.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Statistics) statistics a measure of the association between two random variables, equal to the expected value of the product of the deviations from the mean of the two variables, and estimated by the sum of products of deviations from the sample mean for associated values of the two variables, divided by the number of sample points. Written as Cov (X, Y)
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(koʊˈvɛər i əns)

(in statistics) the value of the product of the standard deviations of two given variants and their correlation coefficient.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.covariance - (statistics) the mean value of the product of the deviations of two variates from their respective means
statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
variance - the second moment around the mean; the expected value of the square of the deviations of a random variable from its mean value
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References in periodicals archive ?
The co variance matrix required for solving the regression problem is based on regularized co-variance matrix described in Ribes et al.
The range of co-variance of G (relationships between individuals) showed even continuous distributed than that of A (Supplementary Figure S1) which allowed co-variance of G (relationships between individuals) to be larger within families because residual variance of G would be bigger than A with a shallow pedigree information (only sire side pedigree).
Another important parameter, which shows directly the combustion quality obtained is the co-variance of the IMEP.
###Analysis of variance###Analysis of variance (ANOVA), analysis of co-variance (ANCOVA)
To verify differences among aerobic decomposition, a co-variance analysis test (ANCOVA) was applied (PAST, v.2.01).
Co-variance components and genetic parameters of beef cattle have been estimated in Brazilian genetic improvement programs by weights calculated at the standard age, such as weight at 210 days (P210), 365 days (P365) and 450 days old (P450).
A co-variance cov(x, y) represents the measure of the strength of correlation among the variables:
P DF DF F MEASURE 0/086 58 1 3/042 Mind centralization Table 3: Result of co-variance analyze, effect of group membership on mental focus grades in 2 groups.
Lastly, new data will be compiled at each center through a new instrumentation system, which includes an eddy co-variance system tower, meteorological equipment and a soil sensor network compatible with national ecosystem observation networks to provide air and soil data.
Analysis of co-variance (ANCOVA) and Pearson correlation tests were used in data analysis.