LARGE SAMPLE THEORY OF A MODIFIED BUCKLEY-JAMES ESTIMATOR FOR REGRESSION-ANALYSIS WITH CENSORED-DATA

被引:147
作者
LAI, TL [1 ]
YING, ZL [1 ]
机构
[1] UNIV ILLINOIS,DEPT STAT,CHAMPAIGN,IL 61820
关键词
LINEAR REGRESSION; CENSORING; LEAST SQUARES ESTIMATOR; EMPIRICAL PROCESS; MARTINGALE;
D O I
10.1214/aos/1176348253
中图分类号
O21 [概率论与数理统计]; C8 [统计学];
学科分类号
020208 ; 070103 ; 0714 ;
摘要
Buckley and James proposed an extension of the classical least squares estimator to the censored regression model. It has been found in some empirical and Monte Carlo studies that their approach provides satisfactory results and seems to be superior to other extensions of the least squares estimator in the literature. To develop a complete asymptotic theory for this approach, we introduce herein a slight modification of the Buckley-James estimator to get around the difficulties caused by the instability at the upper tail of the associated Kaplan-Meier estimate of the underlying error distribution and show that the modified Buckley-James estimator is consistent and asymptotically normal under certain regularity conditions. A simple formula for the asymptotic variance of the modified Buckley-James estimator is also derived and is used to study the asymptotic efficiency of the estimator. Extensions of these results to the multiple regression model are also given.
引用
收藏
页码:1370 / 1402
页数:33
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