Dear all.
Which kind of GMM method should I use to dynamic panel data? FD-GMM or sys GMM?Some people think that if the coefficient of Lag 1 of the dependent variable is larger than 0.8, we should use sys-GMM.What is your idea about choosing between FD-GMM and sys-GMM? Are there some standards for model selection between the two methods? I am looking forward to your reply.

Kind regards!
Raymond