In statistics, the Pearson product-moment correlation coefficient (sometimes referred to as the PPMCC or PCC, or Pearson's r, and is typically denoted by r) is a measure of the correlation (linear dependence) between two variables X and Y, giving a value between +1 and −1 inclusive. It is widely used in the sciences as a measure of the strength of linear dependence between two variables. It was developed by Karl Pearson from a similar but slightly different idea introduced by Francis Galton in the 1880s.
Read more about Pearson Product-moment Correlation Coefficient: Definition, Mathematical Properties, Interpretation, Inference, Pearson's Correlation and Least Squares Regression Analysis, Calculating A Weighted Correlation, Removing Correlation, Reflective Correlation, Scaled Correlation
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