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cff-version: 1.2.0
message: 'To cite package "coxmnar" in publications use:'
type: software
license: GPL-3.0-or-later
title: 'coxmnar: Cox Regression with Missing not at Random Failure Indicators'
version: 0.1.0
identifiers:
- type: doi
  value: 10.32614/CRAN.package.coxmnar
abstract: Implements estimation for the Cox (1972, 1975) <https://doi.org/10.1111/j.2517-6161.1972.tb00899.x>
  <https://doi.org/10.1093/biomet/62.2.269> proportional hazards model when the failure
  indicator (cause of failure) is missing not at random (MNAR), following the two
  adjusted imputation-based estimating equations of Liu and Liu (2026) <https://doi.org/10.1007/s11222-026-10857-1>.
  Also provided for comparison are the full-data partial-likelihood estimator of Andersen
  and Gill (1982) <https://doi.org/10.1214/aos/1176345976>, the complete-case estimator,
  and the missing-at-random imputation estimator of Liu and Wang (2010, Statistica
  Sinica, 20, 1125-1142). The probability models for the failure indicator and for
  the missingness mechanism are estimated jointly by maximum likelihood following
  Sun, Xie, and Liang (2013) <https://doi.org/10.1007/s11425-012-4492-x>, and a Nadaraya-Watson
  kernel-smoothed estimator of the missingness propensity is constructed following
  Qiu, Chen, and Zhou (2015) <https://doi.org/10.1016/j.spl.2014.12.006>. Both an
  asymptotic (sandwich-type) variance estimator and a nonparametric bootstrap variance
  estimator are provided. When failure indicators are fully observed the estimators
  reduce algebraically to the classical Cox partial-likelihood estimator.
authors:
- family-names: Tyagi
  given-names: Shikhar
  email: shikhar1093tyagi@gmail.com
  orcid: https://orcid.org/0000-0003-1606-0844
- family-names: Pandey
  given-names: Arvind
  email: arvindmzu@gmail.com
- family-names: Singh
  given-names: Bhupendra
  email: bhupendra.rana@gmail.com
- family-names: Tripathi
  given-names: Vrijesh
  email: vrijesh.tripathi@uwi.edu
preferred-citation:
  type: manual
  title: 'coxmnar: Cox Regression with Missing Not at Random Failure Indicators'
  authors:
  - family-names: Tyagi
    given-names: Shikhar
    email: shikhar1093tyagi@gmail.com
    orcid: https://orcid.org/0000-0003-1606-0844
  - family-names: Pandey
    given-names: Arvind
    email: arvindmzu@gmail.com
  - family-names: Singh
    given-names: Bhupendra
    email: bhupendra.rana@gmail.com
  - family-names: Tripathi
    given-names: Vrijesh
    email: vrijesh.tripathi@uwi.edu
  year: '2026'
  notes: R package version 0.1.0
  url: https://CRAN.R-project.org/package=coxmnar
repository: https://shikhartyagi.r-universe.dev
commit: 8dc5d1de963067e9d8e12565230bd93d0aae7311
date-released: '2026-07-31'
contact:
- family-names: Tyagi
  given-names: Shikhar
  email: shikhar1093tyagi@gmail.com
  orcid: https://orcid.org/0000-0003-1606-0844
references:
- type: article
  title: Estimation in the Cox proportional hazards model with missing not at random
    failure indicators
  authors:
  - family-names: Liu
    given-names: Yi
  - family-names: Liu
    given-names: Kaiyuan
  journal: Statistics and Computing
  volume: '36'
  year: '2026'
  doi: 10.1007/s11222-026-10857-1
  start: '112'