Spatial Stochastic Frontier with Fixed Effects and Endogeneity R package spefa version 0.1.0 Maximum-likelihood estimation of the spatial autoregressive stochastic frontier model with individual fixed effects (removed by first differencing) and endogenous regressors handled through a Gaussian control function, as in Giannini (2025) <doi:10.1080/17421772.2024.2414962>. Returns coefficient estimates and standard errors, spatially-corrected technical (in)efficiency scores, and direct, indirect and total marginal impacts. Depends only on base R. Software Depends: R (>= 3.5.0) Imports: stats Suggests: knitr, rmarkdown Massimo Giannini <massimo.giannini@uniroma2.it> Comprehensive R Archive Network (CRAN) Massimo Giannini [aut, cre] (University of Rome Tor Vergata, Department of Enterprise Engineering) GPL-3 2026-05-28 application/tgz https://CRAN.R-project.org/package=spefa doi:10.32614/CRAN.package.spefa