“covariance”的概念、定义、翻译、参考文献-科学参考

单词	covariance
释义	covariance [kō`ver·ē·ǝns] ^STATISTICS A measurement of the tendency of two random variables, X and Y, to vary together, given by the expected value of the variable (X-X[OB] )(Y-Y[OB] ), where X[OB] and Y[OB] are the expected values of the variables X and Y respectively.
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