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Pearson's correlation coefficient is 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.
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Romance language "Castilian language" redirects here. For the specific variety of the language, see Castilian Spanish. For the broader branch of Ibero-Romance, see West Iberian languages. Spanish Castilian español castellano Pronunciation [espaˈɲol] ⓘ [kasteˈʝano ...