| 单词 | product moment |
| 释义 | > as lemmasproduct moment product moment n. Statistics (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; cf. Pearson n. 1. ΘΚΠ the world > relative properties > number > probability or statistics > [noun] > variable > relationship between sets of variables > coefficient of correlation correlation coefficient or coefficient of correlation1888 product moment1895 Pearson1903 rho1907 Spearman1907 phi coefficient1929 1895 Econ. Jrnl 5 605 The annexed table gives the value of the coefficient (reckoned by the product-moment method) and of its probable error. 1930 M. Ezekiel Methods Correlation Anal. viii. 127 The value Σ(xy) is sometimes called the product moment. 1972 E. Lukacs Probability & Math. Statistics iv. 90 In the bivariate case one also has a mixed moment (product-moment) of second order. 1992 Lit. & Ling. Computing 7 92/2 The rows of the joint table are then correlated, each with every other, using the Pearson product-moment method. < as lemmas |
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