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http://dx.doi.org/10.5351/KJAS.2014.27.1.001

A Comparison of Survival Distributions with Unequal Censoring Distributions  

Song, Sujeong (Clinical Research & Pharmacovigilance Team, R&D Center, Yuhan Corporation)
Lee, Jae Won (Department of Statistics, Korea University)
Publication Information
The Korean Journal of Applied Statistics / v.27, no.1, 2014 , pp. 1-11 More about this Journal
Abstract
The Weighted Logrank test and its special case, Logrank test are widely used to compare survival distributions; however, these methods are inappropriate when the sample size is small or censoring distributions are not equal since they use test statistics from approximate distributions. A permutation test can be an alternative for small sample cases; however, this should be used only when censoring distributions are equal. To handle cases with small sample size and unequal censoring distributions, the permutation-imputation method was developed to compare two survival distributions. In this paper, approximate method, permutation method and permutation-imputation method were compared using a Logrank test and Prentice-Wilcoxon test for three or more survival distributions comparison.
Keywords
Permutation test; permutation-imputation test; survival distribution;
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