Sobol Indices for Models with Fixed and Stochastic Parameters R package Sobol4R version 0.4.0 Tools to design experiments, compute Sobol sensitivity indices, and summarise stochastic responses inspired by the strategy described by Zhu and Sudret (2021) <doi:10.1016/j.ress.2021.107815>. Includes helpers to optimise toy models implemented in C++, visualise indices with uncertainty quantification, and derive reliability-oriented sensitivity measures based on failure probabilities. It is further detailed in Logosha, Maumy and Bertrand (2022) <doi:10.1063/5.0246026> and (2023) <doi:10.1063/5.0246024> or in Bertrand, Logosha and Maumy (2024) <https://hal.science/hal-05371803>, <https://hal.science/hal-05371795> and <https://hal.science/hal-05371798>. Software Depends: R (>= 3.5.0) Imports: ggplot2, Rcpp (>= 1.0.0), rlang, sensitivity, stats LinkingTo: Rcpp Suggests: knitr, markdown, rmarkdown, simmer, testthat (>= 3.0.0) Frederic Bertrand <frederic.bertrand@lecnam.net> Comprehensive R Archive Network (CRAN) Frederic Bertrand [cre, aut] (ORCID: <https://orcid.org/0000-0002-0837-8281>), Elizaveta Logosha [aut], Myriam Maumy-Bertrand [aut] (ORCID: <https://orcid.org/0000-0002-4615-1512>) GPL-3 2025-12-02 application/tgz https://CRAN.R-project.org/package=Sobol4R doi:10.32614/CRAN.package.Sobol4R