Dear all,

I am working with a panel data (unbalanced) in the context of an ordered probit model. I suspect that there are problems with endogeneity (especially reverse causation or potentially simultaneity). Therefore I would like to determine whether there are issues of reverse causation or simultaneity between my dependent variable and one of the independent variables (VAR1). I am new to econometrics and I wonder what are the simplest options to investigating these issues in Stata. What I am particulary interested is a way to easily test whether DEP and VAR1 suffer from those problems and if there is a way to estimate the oprobit accounting for those issues. The structure of my data is DEP, VAR1, VAR2, VAR3, etc, ID (unique identifier for panel data), Year

I thank you already for your help