拉斯维加斯9888

题 目：Proportional odds model with varying coefficients for censored data

汇报人：Prof.Xingwei Tong

School of Mathematical Sciences, Beijing Normal University

时 间：2009年6月17日下午2：00-3：00

地 点：拉斯维加斯9888新楼217室

提要：In this article, we consider a proportional odds model, which allows one to examine the extent to which covariates interact nonlinearly with an exposure variable for analysis of right-censored data.

A local maximum likelihood approach is presented to estimate nonlinear interactions (the coefficient functions) and the baseline function. The proposed estimators are shown to be consistent and asymptotically normal with the asymptotic variance estimated consistently. %of the local likelihood estimator can be consistently estimated. Also, we develop local profile likelihood ratio method to construct confidence region of coefficient functions. Simulation studies are conducted to evaluate the performances of the proposed estimators, and compare the normal approximation based confidence regions and local profile likelihood ratio based confidence regions. The method is illustrated with Stanford heart transplant data.