Estimate Survival Data with Data Integration R package survkl version 1.0.0 Provides flexible and efficient tools for integrating external risk scores into Cox proportional hazards models while accounting for population heterogeneity. Enables robust estimation, improved predictive accuracy, and user-friendly workflows for modern survival analysis. For more information, see Wang et al. (2023) <doi:10.48550/arXiv.2302.11123>. Software Depends: R (>= 4.0) Imports: Rcpp, ggplot2, stats, cowplot, Matrix, rlang LinkingTo: Rcpp, RcppArmadillo, RcppParallel Suggests: knitr, rmarkdown, survival Yubo Shao <ybshao@umich.edu> Comprehensive R Archive Network (CRAN) Yubo Shao [aut, cre], Lingfeng Luo [aut], Xiaohan Liu [aut], Junyi Qiu [aut], Di Wang [aut], Kevin He [aut] GPL-3 2026-04-21 application/tgz https://CRAN.R-project.org/package=survkl doi:10.32614/CRAN.package.survkl