Dear statalisters,

I am writing you because I am using fractional logistic regressions for my analysis and I need to calculate VIFs, but I read in a paper that "fractional logit regression, and negative binomial regression do not allow the estimation of VIF scores. Thus, we report the VIF scores obtained from estimating the models with ordinary least squares (OLS).".
Now, I was using the command
Code:
 collin
(I use stata 15) and the list of variables, but after reading that quote, I am not sure if I am doing right. could you help me please? am I right using the collin command? How does collin Works?
Thank you so much for any help.

Alejandro