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Median regression and the missing information principle 

Authors: Ian W. Mckeague a;  Sundarraman Subramanian b; Yanqing sun c
Affiliations:   a Department of Statistics, Florida State University,
b Department of Mathematics & Statistics, University of Maine,
c Department of Mathematics, University of North Carolina, Charlotte
DOI: 10.1080/10485250108832873
Publication Frequency: 8 issues per year
Published in: journal Journal of Nonparametric Statistics, Volume 13, Issue 5 2001 , pages 709 - 727
Formats available: PDF (English)
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Abstract

Median regression analysis has robustness properties which make it an attractive alternative to regression based on the mean.In this paper,the missing information principle is applied to a right-censored version of the median regression model,leading to a new estimator for the regression parameters.Our approach adapts Efton's derivation of self-consistency for the Kaplan-Meier estimator to the context of median regression;we replace the least absolute deviation estimating function by its (estimated) conditional expectation given the data.For discrete covariates the new estimator is shown to be asymptotically equivalent to anad hocestimator introduced by Ying,Jung and Wei,and to have improved moderate-sample performance in simulation studies.
Keywords: Least absolute deviation; Martingale; Heteroscedasticity; Counting processes; Kernel conditional Kaplan-Meier estimator; Cox proportional hazards
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