Hi All,
I'm struggling with an equation that has an endogenous regressor (sample selection bias) and also have the endogeneity issue. From my understanding for the sample selection bias the solutions are using xtheckman and Wooldridge models and for the endogeneity issue the solution is using Generalized Method of Moments (GMM), however, I'm not sure how I can implement both of these two models in Stata. I really appreciate any thoughts on that.