Temporal Parametric Hazard Modeling R package TemporalHazard version 1.1.0 Provides native R implementations of the multiphase parametric hazard model of Blackstone, Naftel, and Turner (1986) <doi:10.1080/01621459.1986.10478314> with a focus on behavioral parity, transparent numerics, and reproducible validation against reference outputs from the original 'C'/'SAS' HAZARD program, originally developed at the University of Alabama at Birmingham (UAB). The 'SAS'/'C' code and this R package are currently developed and maintained at The Cleveland Clinic Foundation, and the R code was wholly developed at The Cleveland Clinic Foundation. The generalized temporal decomposition family extends to longitudinal mixed-effects settings (Rajeswaran et al. 2018 <doi:10.1177/0962280215623583>). The package is intentionally implemented in pure R first; performance-critical paths may later be accelerated with 'Rcpp' without changing the public interface. Software Depends: R (>= 4.1.0) Imports: survival Suggests: covr, ggplot2, knitr, lintr, numDeriv, pkgdown, quarto, roxygen2, rmarkdown, scales, testthat (>= 3.0.0) John Ehrlinger <john.ehrlinger@gmail.com> Comprehensive R Archive Network (CRAN) John Ehrlinger [aut, cre, cph] MIT + file LICENSE (https://CRAN.R-project.org/package=TemporalHazard/LICENSE) 2026-06-12 application/tgz https://CRAN.R-project.org/package=TemporalHazard doi:10.32614/CRAN.package.TemporalHazard en-US