Dear Statalisters:

Thanks for reading it!

I'm using a two-period panel data to figure out the impact of a time-invariant variable on time-varying variable，and i was wondering :

1) whether is a effective way to estimate the coefficient of a time-invariant variable by using Correlation Random Effect(CRE) model

2) whether is a feasible explanation about the causal of between time-invariant variable and dependent variable by using this model

3) can i use IV estimation base on CRE model?

Thanks again!