Multivariate Methods • Correlations and Multivariate Techniques • Computations and Statistical Details • Pearson Product-Moment Correlation
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Pearson Product-Moment Correlation
The Pearson product-moment correlation coefficient measures the strength of the linear relationship between two variables. For response variables X and Y, it is denoted as r and computed as
If there is an exact linear relationship between two variables, the correlation is 1 or –1, depending on whether the variables are positively or negatively related. If there is no linear relationship, the correlation tends toward zero.

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Help created on 9/19/2017