Florens, Jean-Pierre; Carrasco, Marine - Econometric Society - 2004
This paper derives conditions under which the generalized method of moments (GMM) estimator is as efficient as the … study the efficiency of GMM in a general framework where the set of moment conditions may be finite, countable infinite, or … a continuum. Our main result is the following. GMM estimator is efficient if and only if the true score belongs to the …