American Statistical Association
New York City
Metropolitan Area Chapter

Mailman School of Public Health
Columbia University
Department of Biostatistics Colloquium



THE PARTLY PROPORTIONAL SINGLE-INDEX HAZARDS MODEL

by

Donglin Zeng, Ph.D.
Department of Biostatistics, School of Public Health
University of North Carolina, Chapel Hill
www.bios.unc.edu/~dzeng/


Abstract

In this talk, we propose the partly proportional single-index hazards model for right censored survival data. This model is an extension of the Cox proportional hazards model and allows flexible semiparametric modeling of covariate effects in a parsimonious way via a single-index. The commonly used profile-kernel method based on the local likelihood is considered for parameter estimation. We show that this popular approach leads to biased estimation. A bias correction method is then proposed and the corrected profile local likelihood estimators are shown to be consistent, asymptotically normal and semiparametrically efficient. We evaluate the finite-sample properties of our estimators through simulation studies and illustrate the proposed model and method with an application to a dataset from the Multicenter AIDS Cohort Study (MACS).

This is joint work with Dr. Kai Ding and Michael Kosorok.

Biographical Note

Donglin Zeng is currently an associate professor in the Department of Biostatistics at the University of North Carolina at Chapel Hill. He obtained his Ph.D. from the Department of Statistics at the University of Michigan in 2001. He won the Noether Young Scholar award in 2008 and was elected an IMS fellow in 2010. His primary research interests are semiparametric models and high-dimensional inference in survival analysis, longitudinal data analysis, and genetic epidemiology. His other collaborations involve cancer studies, breast imaging, and AIDS studies.


Date: Thursday, September 23, 2010
Time: 4:00 - 5:00 P.M.
Location: Mailman School of Public Health
Department of Biostatistics
722 West 168th Street
Biostatistics Computer Lab
6th Floor - Room 656
New York, New York

RESERVATIONS ARE NOT REQUIRED

Informal tea at 3:40 P.M.


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