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Proportional hazards models with discrete frailty

Caroni, Chrys, Crowder, Martin and Kimber, Alan (2009) Proportional hazards models with discrete frailty , Southampton, UK University of Southampton, Statistical Sciences Research Institute 18pp. (Methodology working papers, M09/08).

Record type: Monograph (Working Paper)


We extend proportional hazards frailty models for lifetime data to allow a negative bi-nomial, Poisson, Geometric or other discrete distribution of the frailty variable. This might represent, for example, the unknown number of flaws in an item under test. Zero frailty corresponds to a limited failure model containing a proportion of units that never fail (long- term survivors). Ways of modifying the model to avoid this are discussed. The models are
applied to a previously published set of data on failures of printed circuit boards and to new data on breaking strengths of samples of cord.

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Submitted date: 27 April 2009
Keywords: reliability analysis, lifetime data, proportional hazards, frailty models, discrete distribution, limited failure model


Local EPrints ID: 66092
PURE UUID: 0fb0f0f9-5298-4ba6-ad58-04c3b700a2a5

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Date deposited: 28 Apr 2009
Last modified: 19 Jul 2017 00:27

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Author: Chrys Caroni
Author: Martin Crowder
Author: Alan Kimber

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