Goodman and Kruskal's Gamma

Goodman-Kruskal $\gamma$ is a measure of rank correlation between x and y and is given by $(n_c -n_d) / (n_c + n_d)$, where $n_c$ is the number of concordant pairs of the observations and $n_d$ is the number of discordant pairs.

References

1. Wolfram Research. (2012). GoodmanKruskalGamma. Wolfram Language function. Link
2. Goodman and Kruskal's gamma. (2022, Nov 23). In Wikipedia. [Link](https://en.wikipedia.org/wiki/Goodman_and_Kruskal%27s_gamma]