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# CITATION.cff file created with {cffr} R package
# See also: https://docs.ropensci.org/cffr/
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cff-version: 1.2.0
message: 'To cite package "stagelife" in publications use:'
type: software
license: MIT
title: 'stagelife: Random Number Generation and Inferences for Two-Stage Life-Testing
  Data'
version: 0.1.0
identifiers:
- type: doi
  value: 10.32614/CRAN.package.stagelife
abstract: 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", <https://doi.org/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.
authors:
- family-names: Sharma
  given-names: Vikas Kumar
  email: vksharma@bhu.ac.in
preferred-citation:
  type: manual
  title: 'stagelife: Random Number Generation and Inferences for Two-Stage Life-Testing
    Data'
  authors:
  - family-names: Sharma
    given-names: Vikas Kumar
    email: vksharma@bhu.ac.in
  year: '2026'
  notes: R package version 0.1.0
  url: https://github.com/vksharma-bhu/stagelife
repository: https://vksharma-bhu.r-universe.dev
repository-code: https://github.com/vksharma-bhu/stagelife
commit: 677a8854152460b6044b7e1d25889e861128b7e4
url: https://github.com/vksharma-bhu/stagelife
date-released: '2026-09-30'
contact:
- family-names: Sharma
  given-names: Vikas Kumar
  email: vksharma@bhu.ac.in