Spearman's Rho Calculator

Spearman's Rho is a non-parametric test used to measure the strength of 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 shoe size are correlated (they will be - the taller people are, the bigger their feet are likely to be).

Requirements

  • Scale of measurement must be ordinal (or interval, ratio)
  • Data must be in the form of matched pairs
  • The association must be monotonic (i.e., variables increase in value together, or one increases while the other decreases)

Equation

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