Kruiniger, Hugo - School of Economics and Finance, Queen Mary - 2006
heterogenous distributions. We compare both analytically and by means of Monte Carlo simulations the QML estimators with the GMM … the AB GMM estimator, the QML estimators for ρ only suffer from a weak instruments problem when ρ is close to one if the … small bias when ρ is close to one. In contrast, the AB GMM estimator is inconsistent when ρ is equal to one, and is severly …