Hi all,

I have panel data (T=30) and due to potential threat of non stationarity in my data i've transformed my data into log differences.
There is endogeneity bias in my model as well, i want to apply GMM estimator. Since GMM apply differenced transformation on data so it would be double differencing in my case.

In this case can I use Difference or System GMM on the model? if not which estimator would be appropriate?

I'll appreciate early response.
Thanks