Regression with Skew-Normally Distributed Error Term R package snreg version 1.2.0 Models with skew‑normally distributed and thus asymmetric error terms, implementing the methods developed in Badunenko and Henderson (2023) "Production analysis with asymmetric noise" <doi:10.1007/s11123-023-00680-5>. The package provides tools to estimate regression models with skew‑normal error terms, allowing both the variance and skewness parameters to be heteroskedastic. It also includes a stochastic frontier framework that accommodates both i.i.d. and heteroskedastic inefficiency terms. Software Imports: Formula, npsf Suggests: knitr, rmarkdown Oleg Badunenko <Oleg.Badunenko@brunel.ac.uk> Comprehensive R Archive Network (CRAN) Oleg Badunenko [aut, cre] (ORCID: <https://orcid.org/0000-0001-7216-0861>), John Burkardt [ctb, cph] (Author of C code for Owen T function) GPL-3 2026-02-06 application/tgz https://CRAN.R-project.org/package=snreg doi:10.32614/CRAN.package.snreg