Kendall's Rank Correlation Coefficient

Kendall's $\tau$ between and is given by $(n_c - n_d) / \sqrt((n_c+n_d+n_x)(n_c+n_d+n_y)$, where is the number of concordant pairs of observations, is the number of discordant pairs, is the number of ties involving only the variable, and is the number of ties involving only the variable." ;

References

1. Wolfram Research. (2012). KendallTau. Wolfram Language function. Link
2. Kendall's Tau. (2023, May 23). In Wikipedia. [Link](https://en.wikipedia.org/wiki/Kendall_rank_correlation_coefficient]""",