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Computational Statistics

, Volume 31, Issue 4, pp 1513–1538 | Cite as

Stochastic EM algorithms for parametric and semiparametric mixture models for right-censored lifetime data

  • Laurent BordesEmail author
  • Didier Chauveau
Original Paper

Abstract

Mixture models in reliability bring a useful compromise between parametric and nonparametric models, when several failure modes are suspected. The classical methods for estimation in mixture models rarely handle the additional difficulty coming from the fact that lifetime data are often censored, in a deterministic or random way. We present in this paper several iterative methods based on EM and Stochastic EM methodologies, that allow us to estimate parametric or semiparametric mixture models for randomly right censored lifetime data, provided they are identifiable. We consider different levels of completion for the (incomplete) observed data, and provide genuine or EM-like algorithms for several situations. In particular, we show that simulating the missing data coming from the mixture allows to plug a standard R package for survival data analysis in an EM algorithm’s M-step. Moreover, in censored semiparametric situations, a stochastic step is the only practical solution allowing computation of nonparametric estimates of the unknown survival function. The effectiveness of the new proposed algorithms are demonstrated in simulation studies and an actual dataset example from aeronautic industry.

Keywords

Censored data Stochastic EM algorithm Finite mixture Reliability Semiparametric mixtures Survival data 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.LMAP – UMR CNRS 5142Univ. Pau & Pays de l’AdourPauFrance
  2. 2.MAPMO – UMR CNRS 7349Univ. d’OrléansOrléansFrance

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