Definition
Pearson's correlation coefficient between two variables is defined as the covariance of the two variables divided by the product of their standard deviations. The form of the definition involves a "product moment", that is, the mean (the first moment about the origin) of the product of the mean-adjusted random variables; hence the modifier product-moment in the name.
Read more about this topic: Pearson Product-moment Correlation Coefficient
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—Samuel Taylor Coleridge (17721834)