A semi-parametric regression model for analysis of middle censored lifetime data

S. Rao Jammalamadaka (), Sundaresan Nair Prasad () and Paduthol Godan Sankaran ()
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S. Rao Jammalamadaka: University of California, Santa Barbara - USA
Sundaresan Nair Prasad: Cochin University of Science and Technology, Kerala - India
Paduthol Godan Sankaran: Cochin University of Science and Technology, Kerala - India

Statistica, 2016, vol. 76, issue 1, 27-40

Abstract: Middle censoring introduced by Jammalamadaka and Mangalam (2003), refers to data arising in situations where the exact lifetime becomes unobservable if it falls within a random censoring interval, otherwise it is observable. In the present paper we propose a semi-parametric regression model for such lifetime data, arising from an unknown population and subject to middle censoring. We provide an algorithm to find the nonparametric maximum likelihood estimator (NPMLE) for regression parameters and the survival function. The consistency of the estimators are established. We report simulation studies to assess the finite sample properties of the estimators. We then analyze a real life data on survival times for diabetic patients studied by Lee et al. (1988).

Keywords: Middle censoring; Proportional Hazards model; Self consistent estimator (search for similar items in EconPapers)
Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:bot:rivsta:v:76:y:2016:i:1:p:27-40

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