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noun, Statistics.
one of a number of measures of correlation, usually assuming values from +1 to −1.
(statistics) a statistic measuring the degree of correlation between two variables as by dividing their covariance by the square root of the product of their variances. The closer the correlation coefficient is to 1 or –1 the greater the correlation; if it is random, the coefficient is zero See also Pearson’s correlation coefficient, Spearman’s rank-order coefficient


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