Hi Statalisters,

I have panel count data and it appears to me that it has rather a negative binomial distribution and not poisson. To make regression I was using nbreg and glm both with vce (robust) and time effects. My question is why is not there a way to use xtnbreg with robust standard errors? Or should I go for the xtpoisson? Since I have panel data it seems to me that the xt estimations are those I should use.