Package: stagelife
Type: Package
Title: Random Number Generation and Inferences for Two-Stage
        Life-Testing Data
Version: 0.1.0
Authors@R: person("Vikas Kumar", "Sharma", email = "vksharma@bhu.ac.in", role = c("aut", "cre"))
Description: Provides random number generation, estimation, and
        hypothesis testing for two-stage life-testing experiments in
        which units begin on a baseline stress and, at a fixed or
        random change point, some or all surviving units move to an
        elevated stress ("stage life testing"), following the
        cumulative-exposure model of Laumen and Cramer (2019), "Stage
        life testing", <doi:10.1002/nav.21874>. Twelve baseline
        lifetime distributions are supplied (Weibull, Power Lindley,
        Exponentiated Lindley, Exponentiated Exponential,
        Marshall-Olkin Exponential, Lomax, Exponentiated Teissier,
        Log-Logistic, Chen, Log-normal, Gamma, and Power Muth/Power
        Teissier) together with three parameter-sharing cases (common,
        shape1, shape11). The package implements data simulation under
        both the fixed-proportion (typeP) and fixed-count (typeM) rules
        and the simple-step-stress special case, maximum likelihood
        estimation using a hybrid Nelder-Mead and BFGS optimisation
        routine, asymptotic (Wald) and non-parametric/parametric
        bootstrap confidence intervals (including log-scale variants
        that guarantee a positive interval), a stage-1-observation
        planning probability, Kolmogorov-Smirnov goodness-of-fit
        testing with a parametric-bootstrap correction for estimated
        parameters, likelihood-ratio and information criteria for
        nested/non-nested model comparison, and diagnostic plots
        comparing fitted and empirical distributions, including the
        cumulative distribution function (CDF), survival function,
        probability-probability (P-P), and quantile-quantile (Q-Q)
        plots.
License: MIT + file LICENSE
Encoding: UTF-8
LazyData: true
Depends: R (>= 4.1.0)
Imports: compiler, ggplot2, graphics, lamW, parallel, stats
Suggests: knitr, rmarkdown, testthat (>= 3.0.0)
VignetteBuilder: knitr
Config/testthat/edition: 3
URL: https://github.com/vksharma-bhu/stagelife
BugReports: https://github.com/vksharma-bhu/stagelife/issues
Config/roxygen2/version: 8.1.0
NeedsCompilation: no
Packaged: 2026-11-03 18:39:22 UTC; root
Author: Vikas Kumar Sharma [aut, cre]
Maintainer: Vikas Kumar Sharma <vksharma@bhu.ac.in>
Repository: https://cran.r-universe.dev
Date/Publication: 2026-11-03 15:23:11 UTC
RemoteUrl: https://github.com/cran/stagelife
RemoteRef: HEAD
RemoteSha: bd2831de9174160ed7304b31f26438e2cac18fba