Cramer's v

It measures the strength of association between two nominal variables. It ranges from 0 (no association) to 1 (perfect association).

Formula:

$v=\sqrt{\frac{{\chi }^2/n}{min(c-1,r-1)}}$

Where n = sample size, r = row count, c = column count and ${\chi }^2$ is chi-square procedure.

Degrees of freedom	Small	Medium	Large
1	0.10	0.30	0.50
2	0.07	0.21	0.35
3	0.06	0.17	0.29
4	0.05	0.15	0.25
5	0.04	0.13	0.22