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单词 product moment
释义

product moment

Statistics
noun
(With reference to a set of pairs of statistical data) the sum of the products of the elements of each pair; frequently attributive (usually with hyphen), designating a correlation coefficient (symbol r) calculated from this, equal to the covariance divided by the geometric mean of the variances.

Origin

Late 19th century; earliest use found in The Economic Journal.

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更新时间:2024/12/23 13:37:58