Pearson Correlation Coefficient Calculator

The Pearson correlation coefficient is used to measure the strength of a linear association between two variables, where the value r = 1 means a perfect positive correlation and the value r = -1 means a perfect negataive correlation. So, for example, you could use this test to find out whether people's height and weight are correlated (they will be - the taller people are, the heavier they're likely to be).

Requirements for Pearson's correlation coefficient

  • Scale of measurement should be interval or ratio
  • Variables should be approximately normally distributed
  • The association should be linear
  • There should be no outliers in the data


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