Fast Royston-Parmar Flexible Parametric Survival Models R package rpsurv version 0.7.1 Fits Royston-Parmar flexible parametric survival models (Royston and Parmar, 2002) <doi:10.1002/sim.1203> on the log cumulative hazard, odds, and probit scales, with time-varying (non-proportional) covariate effects via restricted cubic splines in log time. The likelihood and its analytic gradient are evaluated in C++ with 'RcppParallel', giving large speedups over pure-R implementations for large datasets. Software Depends: R (>= 4.1.0) Imports: Rcpp, RcppParallel, survival, stats, graphics, grDevices LinkingTo: Rcpp, RcppParallel Suggests: rstpm2, flexsurv, numDeriv, testthat (>= 3.0.0), knitr, rmarkdown Imad El Badisy <elbadisyimad@gmail.com> Comprehensive R Archive Network (CRAN) Imad El Badisy [aut, cre] MIT + file LICENSE (https://CRAN.R-project.org/package=rpsurv/LICENSE) 2026-09-11 application/tgz https://CRAN.R-project.org/package=rpsurv doi:10.32614/CRAN.package.rpsurv