Goodman-Kruskal gamma rank-correlation coefficient (concordant minus discordant over untied pairs)
GoodmanKruskalGamma[v1, v2]
GoodmanKruskalGamma[m]
GoodmanKruskalGamma[m1, m2]
GoodmanKruskalGamma[dist]
GoodmanKruskalGamma[dist, i, j]
GoodmanKruskalGamma[{1, 2, 3, 1, 4, 6}, {2, 1, 8, 7, 2, 1}]
→ -1/3GoodmanKruskalGamma[{1.1, 2, 3, 1, 4, 6}, {2, 1, 8, 7, 2, 1}]
→ -0.38461538461538464GoodmanKruskalGamma[N[{1, 3, 5, 6, 6}, 30], N[{2, -1, 6, 8, 9}, 30]]
→ 0.7777777777777778