coefficient of correlation(n = noun.cognition) correlation, correlation coefficient - a statistic representing how closely two variables co-vary; it can vary from -1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation); "what is the correlation between those two variables?"
is a kind of parametric statistic
has particulars: pearson product-moment correlation coefficient, product-moment correlation coefficient, multiple correlation coefficient, biserial correlation, biserial correlation coefficient, chance-half correlation, split-half correlation, tetrachoric correlation, tetrachoric correlation coefficient

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