$\text{VIF}_j = \frac{1}{1-R_j^2}$; problematic when $\text{VIF} > 10$

$\text{VIF}_j = R_j^2$; problematic when $\text{VIF} > 1$

$\text{VIF}_j = 1 - R_j^2$; problematic when $\text{VIF} < 0.1$

$\text{VIF}_j = \frac{R_j^2}{1-R_j^2}$; problematic when $\text{VIF} > 5$