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NONPARAMETRIC ESTIMATION FOR MIDDLE-CENSORED DATA 

Authors: S. Rao Jammalamadaka a; Vasudevan Mangalam a
Affiliation:   a Department of Statistics and Applied Probability, University of California, Santa Barbara, CA 93106, USA.
DOI: 10.1080/1048525031000089266
Publication Frequency: 8 issues per year
Published in: journal Journal of Nonparametric Statistics, Volume 15, Issue 2 April 2003 , pages 253 - 265
Number of References: 14
Formats available: PDF (English)
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Abstract

This paper provides the self-consistent estimator (SCE) and the nonparametric maximum likelihood estimator (NPMLE) for "middle-censored" data, in which a data value becomes unobservable if it falls within a random interval. We provide an algorithm to find the SCE and show that the NPMLE satisfies the self-consistency equation. We find a sufficient condition for the SCE to be concentrated on the uncensored observations. In addition, we find sufficient conditions for the consistency of the SCE and prove that consistency holds for the special case when one of the ends is a constant. Some simulation results and an illustrative example, using Danish melanoma data set, are provided.
Keywords: Survival Function; Middle-censoring; Self-consistency; Nonparametric Maximum Likelihood Estimation
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