单词	covariance
释义	covariance noun co·​vari·​ance ˌkō-ˈver-ē-ən(t)s  ˈkō-ˌver- 1 : the expected value of the product of the deviations of two random variables from their respective means 2 : the arithmetic mean of the products of the deviations of corresponding values of two quantitative variables from their respective means Example Sentences Recent Examples on the Web In practice, the challenge is often figuring out how to break the general covariance of Einstein’s equations — that is, how to choose a specific coordinate system that is well suited to solving a specific problem. Quanta Magazine, 14 Mar. 2018 Word History First Known Use 1931, in the meaning defined at sense 1
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