Sample Size Calculation for Rank Tests Comparing K Survival Distributions

Sin Ho Jung, Siu Hui

Research output: Contribution to journalArticle

14 Scopus citations


Rank tests, such as logrank or Wilcoxon rank sum tests, have been popularly used to compare survival distributions of two or more groups in the presence of right censoring. However, there has been little research on sample size calculation methods for rank tests to compare more than two groups. An existing method is based on a crude approximation, which tends to underestimate sample size, i.e., the calculated sample size has lower power than projected. In this paper we propose an asymptotically correct method and an approximate method for sample size calculation. The proposed methods are compared to other methods through simulation studies.

Original languageEnglish (US)
Pages (from-to)361-373
Number of pages13
JournalLifetime data analysis
Issue number4
StatePublished - Dec 1 2002


  • Accrual period
  • Follow-up period
  • Logrank test
  • Noncentral χ test
  • Wilcoxon test

ASJC Scopus subject areas

  • Applied Mathematics
  • Medicine(all)

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