covariance

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1 - covariance definition | investopedia

A statistical measure of the variance of two random variables that are observed or measured in the same mean time period. This measure is equal to the product ...
http://www.investopedia.com/terms/c/covariance.asp

2 - covariance definition | investopedia

A statistical measure of the variance of two random variables that are observed or measured in the same mean time period. This measure is equal to the product ...
http://www.investopedia.com/terms/c/covariance.asp

3 - covariance -- from wolfram mathworld

Definition of covariance: Degree to which the value of a dependent variable and an associated independent variable moves in tandem. Positive covariance ...
http://mathworld.wolfram.com/Covariance.html

4 - covariance -- from wolfram mathworld

The covariance between two random variables X and Y , denoted by [eq1] , is defined as follows: [eq2] provided the above expected values exist and are ...
http://mathworld.wolfram.com/Covariance.html