A New Method for the Comparison of Survival functions using the Ranking of Median

Abstract

The value of the median in the duration models is very important either in the interpretation of the results obtained or in the comparison between survival functions in the situation where the risk functions and converge in the time . These test methods are considered more effective than log-rank and Wilcoxon tests when the survival curves are not proportional. In this article we use a classification function in the objective is to probability the median parameter, this method makes it possible to determine an interval with different probabilistic weights and simplifies the comparison between the survival functions