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Pearson correlation coefficient (In statistics, the Pearson correlation coefficient (PCC, pronounced /ˈpɪərsən/), also referred to as Pearson's r, the Pearson product-moment correlation coefficient (PPMCC) or the bivariate correlation,[1] is a statistic that measures linear correlation between two variables X and Y.  wikipedia.org Demidov_Evgeny) | |||