Cox Models for Time-to-Event Data with Nonparametric Discrete Group-Specific Frailties R package discfrail version 0.2 Functions for fitting Cox proportional hazards models for grouped time-to-event data, where the shared group-specific frailties have a discrete nonparametric distribution. The methods proposed in the package is described by Gasperoni, F., Ieva, F., Paganoni, A. M., Jackson, C. H., Sharples, L. (2018) <doi:10.1093/biostatistics/kxy071>. There are also functions for simulating from these models, with a nonparametric or a parametric baseline hazard function. Software Depends: R (>= 3.3.0), survival Imports: graphics, Matrix, numDeriv, stats, utils Suggests: knitr, rmarkdown Francesca Gasperoni <francesca.gasperoni@polimi.it> Comprehensive R Archive Network (CRAN) Francesca Gasperoni [aut, cre], Christopher Jackson [aut] GPL-3 2025-06-18 application/tgz https://CRAN.R-project.org/package=discfrail doi:10.32614/CRAN.package.discfrail