GMM method

[Salma Gallas]

Goodnight all,
I have some problems regarding the GMM method for a sample (panel study) of 14 countries and a period from 2000-2015. the results are not good with the extabond command, also the lagged coefficient of the dependent variable is of negative sign, as well as the other coefficients of the exogenous variables are large. I don't know what to do and which stata command is good. thank you .

[Salma Gallas]

* xtabond command

[Sebastian Kripfganz]

The following presentation might be of help:

• Kripfganz, S. (2019). Generalized method of moments estimation of linear dynamic panel data models. Proceedings of the 2019 London Stata Conference.