**** 2012/11/28 - version 0.1 **** This is the first version available for public download. We wait your comments for futur improvments. **** 2013/07/17 - version 0.2 **** We included a sample of real data from the DIVAT network (http://www.divat.fr). This data set is used in the original paper. Each hospital is used as one study in which the patient and graft survival is plotted according to kidney post transplantation time. The individual data are also provided in order to compare results with previous aggregated data. This version 0.2 is also compatible with R > 3.0. **** 2013/09/02 - version 0.3 **** A bug was corrected in the program concerning the computation of the area under the survival curve. **** 2014/06/30 - version 0.4 **** A bug was corrected in the program concerning the computation of the conditional survival probabilities between two consecutive time of the same study.