Stochastic Metafrontier Analysis // Implements stochastic metafrontier analysis for productivity and performance benchmarking across firms operating under different technologies. Contains routines for the deterministic metafrontier envelope of O'Donnell et al. (2008) doi:10.1007/s00181-007-0119-4 via linear and quadratic programming, and the stochastic metafrontier of Huang et al. (2014) doi:10.1007/s11123-014-0402-2. Also supports latent class stochastic metafrontier analysis and sample selection correction stochastic metafrontier models. Depends on the 'sfaR' package by Dakpo et al. (2023) https://CRAN.R-project.org/package=sfaR.