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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.
| Version: | 0.1.0 |
| Depends: | R (≥ 4.1.0) |
| Imports: | compiler, ggplot2, graphics, lamW, parallel, stats |
| Suggests: | knitr, rmarkdown, testthat (≥ 3.0.0) |
| Published: | 2026-11-03 |
| DOI: | 10.32614/CRAN.package.stagelife |
| Author: | Vikas Kumar Sharma [aut, cre] |
| Maintainer: | Vikas Kumar Sharma <vksharma at bhu.ac.in> |
| BugReports: | https://github.com/vksharma-bhu/stagelife/issues |
| License: | MIT + file LICENSE |
| URL: | https://github.com/vksharma-bhu/stagelife |
| NeedsCompilation: | no |
| Citation: | stagelife citation info |
| Materials: | README, NEWS |
| CRAN checks: | stagelife results |
| Reference manual: | stagelife.html , stagelife.pdf |
| Vignettes: |
Introduction to stagelife: Two-Stage Life Testing (source, R code) |
| Package source: | stagelife_0.1.0.tar.gz |
| Windows binaries: | r-devel: stagelife_0.1.0.zip, r-release: stagelife_0.1.0.zip, r-oldrel: stagelife_0.1.0.zip |
| macOS binaries: | r-release (arm64): stagelife_0.1.0.tgz, r-oldrel (arm64): stagelife_0.1.0.tgz, r-release (x86_64): stagelife_0.1.0.tgz, r-oldrel (x86_64): stagelife_0.1.0.tgz |
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These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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