covariance -
(statistics) the mean value of the product of the deviations of two variates from their respective means
variance an official dispensation to act contrary to a rule or regulation (typically a building regulation); "a zoning variance"
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
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Wiktionary
Substantiv
covariance -
A statisticalmeasure defined as \scriptstyle\operatorname{CovX, Y \,\mu and \scriptstyle EY\,=\,\nu.
covariance -
The conversion of data types from wider to narrower in certain situations.
Wikipedia
Covariance is a measure of how much two variables change together. Variance is a special case of the covariance when the two variables are identical.
OmegaWiki Dictionary
Ω
covariance A statistical measure of the variance of two random variables measured in the same mean time period.
