In addition, Efron proposed a test based on the conditional probability of censored data for two samples cases. ![]() Many nonparametric tests based on the Kaplan-Meier estimator for survival curves, such as Gehan’s generalized Wilcoxon test, the Cox-Mantel test, the logrank test, and Peto tests, have been proposed and implemented in major statistical software. In analyzing data with censored observations, it is a common task to compare several survival curves.
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