Jung SH, Hui S. Sample size calculation for rank tests comparing K survival distributions. Lifetime Data Anal 2002; 8(4):361-73.
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.
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