HM Treasury Green Book Cost-Benefit Analysis Primitives R package greenbook version 0.1.0 Implements cost-benefit analysis primitives from HM Treasury Green Book guidance (HM Treasury, 2022, 2026): the kinked Social Time Preference Rate ('STPR'), discount factors, net present value ('NPV'), equivalent annual cost, and real-terms rebasing using the GDP deflator. Designed for UK central government appraisal and evaluation. Bundled parameter tables carry vintage metadata for reproducibility. Software Depends: R (>= 4.1.0) Imports: cli (>= 3.6.0), stats, utils Suggests: testthat (>= 3.0.0), knitr, rmarkdown, inflateR, openxlsx, officer, flextable Charles Coverdale <charles.f.coverdale@gmail.com> Comprehensive R Archive Network (CRAN) Charles Coverdale [aut, cre] MIT + file LICENSE (https://CRAN.R-project.org/package=greenbook/LICENSE) 2026-04-28 application/tgz https://CRAN.R-project.org/package=greenbook doi:10.32614/CRAN.package.greenbook en-US