Learn how to compute the Pearson, Spearman, and Kendall correlation coefficients by hand to evaluate the relationship between two variables — Introduction In statistics, a correlation is used to evaluate the relationship between two variables. In a previous post, we showed how to compute a correlation and perform a correlation test in R. In this post, we illustrate how to compute the Pearson, Spearman, and Kendall correlation coefficients by hand and under…