Notes, Comments and Preliminary results Jan 13 2017 Pedro Macedo and Elvira Silva   Sensitivity of directional technical inefficiency measures to the choice of the direction vector: a simulation study   Abstract  Contact Information  Citation  Full Text  -  Note   Feb 17 2010 Pedro Macedo and Elvira Silva   A stochastic production frontier model with a translog specification using the generalized maximum entropy estimator   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result