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Dealing with Ties in Failure Time Data

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  • Meei Pyng Ng
  • Ray Watson

Abstract

In dealing with ties in failure time data the mechanism by which the data are observed should be considered. If the data are discrete, the process is relatively simple and is determined by what is actually observed. With continuous data, ties are not supposed to occur, but they do because the data are grouped into intervals (even if only rounding intervals). In this case there is actually a non–identifiability problem which can only be resolved by modelling the process. Various reasonable modelling assumptions are investigated in this paper. They lead to better ways of dealing with ties between observed failure times and censoring times of different individuals. The current practice is to assume that the censoring times occur after all the failures with which they are tied.

Suggested Citation

  • Meei Pyng Ng & Ray Watson, 2002. "Dealing with Ties in Failure Time Data," Australian & New Zealand Journal of Statistics, Australian Statistical Publishing Association Inc., vol. 44(4), pages 467-478, December.
  • Handle: RePEc:bla:anzsta:v:44:y:2002:i:4:p:467-478
    DOI: 10.1111/1467-842X.00248
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