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Tied Survival Times In Survival Analysis


  • Durdu Karasoy
  • Sena Keskin Kaplan


Survival analysis is generally defined as a set of methods for analyzing data where the outcome variable is the time until the occurrence of an event of interest. One of the methods commonly used in the survival analysis is Cox regresion model which is used to determine the factors that impact on survival times. Cox regression model has assumptions. One of them is proportional hazards assumption and the another one is there is no tied data between event times. However, in real applications, tied event times are commonly observed and Cox’s partial likelihood function needs to be modified to handle ties. It is well known methods that the Exact method, Breslow method, Efron method and Discrete method for handling tied event times. Firstly, the methods are analysed during the study, Breslow, Efron and Exact methods, which is applied on a stomach canser data set (there is tied data between event times) It was decided that Cox regression with Exact Method is the best model. Than this methods is applied Acute Myocardial Infarction data set which has no tied data between event times and it is found the same resuts at all methods.

Suggested Citation

  • Durdu Karasoy & Sena Keskin Kaplan, 2017. "Tied Survival Times In Survival Analysis," Alphanumeric Journal, Bahadir Fatih Yildirim, vol. 5(1), pages 85-102, June.
  • Handle: RePEc:anm:alpnmr:v:5:y:2017:i:1:p:85-102

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    More about this item


    Cox Regression; Survival Analysis; Tied Survival Times;

    JEL classification:

    • C24 - Mathematical and Quantitative Methods - - Single Equation Models; Single Variables - - - Truncated and Censored Models; Switching Regression Models; Threshold Regression Models
    • C80 - Mathematical and Quantitative Methods - - Data Collection and Data Estimation Methodology; Computer Programs - - - General


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