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Abstract Details
Activity Number:
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60
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Type:
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Topic Contributed
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Date/Time:
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Sunday, July 29, 2012 : 4:00 PM to 5:50 PM
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Sponsor:
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Section on Nonparametric Statistics
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Abstract - #304470 |
Title:
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Censored Quantile Regression with Partially Functional Effects
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Author(s):
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Jing Qian*+ and Limin Peng
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Companies:
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University of Massachusetts-Amherst and Emory University
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Address:
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715 North Pleasant St, Amherst, MA, 01003-9304, United States
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Keywords:
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Censoring ;
Martingale ;
Quantile regression ;
Resampling ;
Varying covariate effect
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Abstract:
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Quantile regression offers a flexible approach to analyzing survival data, allowing each covariate effect to vary with quantiles. In practice, constancy is often found to be adequate for some covariates. In this paper, we study censored quantile regression tailored to the partially functional effect setting with a mixture of varying and constant effects. Such a model can offer a simpler view regarding covariate-survival association and, moreover, can enable improvement in estimation efficiency. We propose profile estimating equations and present an iterative algorithm that can be readily and stably implemented. Asymptotic properties of the resultant estimators are established. A simple resampling-based inference procedure is developed and justified. Extensive simulation studies demonstrate efficiency gains of the proposed method over a naive two-stage procedure. The proposed method is illustrated via an application to a recent renal dialysis study.
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Authors who are presenting talks have a * after their name.
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