1. frontier: Stochastic Frontier Analysis - Maximum Likelihood Estimation of Stochastic Frontier Production and Cost Functions. Two specifications are available: the error components model (Battese and Coelli, 1992) and the efficiency effects model (Battese and Coelli, 1995).
6. Generalized method of moments - This package offers a complete set of tools to estimate models based on moment conditions. It includes the generalized method of moments (GMM) and the generalized empirical likelihood (GEL).