Dear researchers and professors.
I want to confirm my knowledge: i run the GMM system in Stata , and i want to know it's necessary to have stationarity of variables only in difference or also necessary in level . Thank you for your answers.
I want to confirm my knowledge: i run the GMM system in Stata , and i want to know it's necessary to have stationarity of variables only in difference or also necessary in level . Thank you for your answers.
