Abstract
Two commonly used tests for comparison of survival curves are the generalized Wilcoxon procedure of Gehan (1965) and Breslow (1970) and the logrank test proposed by Mantel (1966) and Cox (1972). In applications, the logrank test is often used after checking for validity of the proportional hazards (PH) assumption, with Wilcoxon being the fallback method when the PH assumption fails.
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