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Covariance (disambiguation) : ウィキペディア英語版 | Covariance (disambiguation)
In mathematics and physics, covariance is a measure of how much two variables change together, and may refer to: ==Statistics==
* Covariance matrix, a matrix of covariances between a number of variables. * Covariance or cross-covariance between two random variables or data sets. * Autocovariance, the covariance of a signal with a time-shifted version of itself. * Covariance function, a function giving the covariance of a random field with itself at two locations.
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