Lifetime Data Analysis

, Volume 13, Issue 3, pp 399–420 | Cite as

Maximum likelihood estimation for tied survival data under Cox regression model via EM-algorithm



We consider tied survival data based on Cox proportional regression model. The standard approaches are the Breslow and Efron approximations and various so called exact methods. All these methods lead to biased estimates when the true underlying model is in fact a Cox model. In this paper we review the methods and suggest a new method based on the missing-data principle using EM-algorithm that leads to a score equation that can be solved directly. This score has mean zero. We also show that all the considered methods have the same asymptotic properties and that there is no loss of asymptotic efficiency when the tie sizes are bounded or even converge to infinity at a given rate. A simulation study is conducted to compare the finite sample properties of the methods.


Cox regression model Tied survival data EM-algorithm Asymptotics 


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Department of BiostatisticsUniversity of CopenhagenCopenhagen KDenmark
  2. 2.Department of Mathematics and StatisticsThe University of North Carolina at CharlotteCharlotteUSA

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