Dec 03, 2019 · The Pearson Correlation Coefficient (which used to be called the Pearson ProductMoment Correlation Coefficient) was established by Karl Pearson in the early 1900s. It tells us how strongly things are related to each other, and what direction the relationship is in! The formula is r = Σ(XMx)(YMy) / (N1)SxSy
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