Variable Selection in Linear Mixed Model for Longitudinal Data

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Title: Variable Selection in Linear Mixed Model for Longitudinal Data
Author: Lan, Lan
Advisors: Daowen Zhang, Committee Chair
Hao Helen Zhang, Committee Co-Chair
Marie Davidian, Committee Member
Dennis Boos, Committee Member
Abstract: Fan and Li (JASA, 2001) proposed a family of variable selection procedures for certain parametric models via a nonconcave penalized likelihood approach, where significant variable selection and parameter estimation were done simultaneously, and the procedures were shown to have the oracle property. In this presentation, we extend the nonconcave penalized likelihood approach to linear mixed models for longitudinal data. Two new approaches are proposed to select significant covariates and estimate fixed effect parameters and variance components. In particular, we show the new approaches also possess the oracle property when the tuning parameter is chosen appropriately. We assess the performance of the proposed approaches via simulation and apply the procedures to data from the Multicenter AIDS Cohort Study.
Date: 2006-08-17
Degree: PhD
Discipline: Statistics

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