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Activity Number: 412
Type: Contributed
Date/Time: Tuesday, July 31, 2012 : 2:00 PM to 3:50 PM
Sponsor: Section on Statistics in Epidemiology
Abstract - #305512
Title: Simulation Study of Profile Likelihood Method in the Accelerated Failure Time Model
Author(s): Yinding Wang*+
Companies: University of South Carolina
Address: 1041 marion street, Columbia, SC, 29201, United States
Keywords: Accelerated failure time model ; Proportional hazards model ; Profile likelihood ; Censored data ; Semi-parametric ; Survival analysis

The proportional hazards (PH) model and the accelerated failure time (AFT) model are the most popular models to fit the censoring data. Sometimes, the PH assumption cannot be satisfied, and therefore, the AFT model becomes a useful alternative to the PH model. Comparing with the least square method and the rank estimation method, the profile likelihood method needs less computation time in estimating the parameters and associated variances in the semi-parametric AFT model. The main aim of this paper is to investigate the impact of the different bandwidths on the estimations in the profile likelihood method. Additionally, we also evaluate its performances according to the different sample sizes and censoring rates. Finally, we make recommendation of its usage in practice. For illustration, we apply the semi-parametric AFT model to the real dataset: methadone maintenance treatment, using the profile likelihood method.

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