Kendall's rank correlation coefficient or Kendall's tau coefficient is a non-parametric statistic used to measure the association between two ordinal variables. It is a type of rank correlation. It measures the similarity or dissimilarity between two variables. If both the variables are binary, then Pearson's = Spearman's = Kendall's tau.
Till now, we have seen descriptive statistics topics such as central measures, dispersion measures, distribution measures, and variable relationship measures. It's time to jump to the inferential statistics topics such as the central limit theorem, sampling techniques, and parametric and non-parametric tests.
