I've just released version 1.1 of the "frontier" function package for stochastic frontier modelling of production/cost functions, which now incorporates the brand new specification test by Alecos Papadopoulos and Parmeter (EcLett 2023). More work is under way with Francesca Di Iorio to implement panel estimators for frontier models. ------------------------------------------------------- Riccardo (Jack) Lucchetti Dipartimento di Scienze Economiche e Sociali (DiSES) Università Politecnica delle Marche (formerly known as Università di Ancona) r.lucchetti(a)univpm.it http://www2.econ.univpm.it/servizi/hpp/lucchetti -------------------------------------------------------