An illness-death stochastic model in the analysis of longitudinal dementia data

Research output: Contribution to journalArticle

17 Scopus citations


A significant source of missing data in longitudinal epidemiological studies on elderly individuals is death. Subjects in large scale community-based longitudinal dementia studies are usually evaluated for disease status in study waves, not under continuous surveillance as in traditional cohort studies. Therefore, for the deceased subjects, disease status prior to death cannot be ascertained. Statistical methods assuming deceased subjects to be missing at random may not be realistic in dementia studies and may lead to biased results. We propose a stochastic model approach to simultaneously estimate disease incidence and mortality rates. We set up a Markov chain model consisting of three states, non-diseased, diseased and dead, and estimate the transition hazard parameters using the maximum likelihood approach. Simulation results are presented indicating adequate performance of the proposed approach.

Original languageEnglish (US)
Pages (from-to)1465-1475
Number of pages11
JournalStatistics in Medicine
Issue number9
StatePublished - May 15 2003


  • Dementia studies
  • Informative missing
  • Longitudinal data
  • Stochastic model

ASJC Scopus subject areas

  • Epidemiology

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