In survival analysis the log rank test is commonly used to compare the Kaplan-Meier curves of two treatments. Part of our role is to provide the SAS(R) code to perform the log rank test, but this is only part of the picture. Do you understand what assumptions are being made? Do you...
We consider a comparison of Kaplan–Meier curves from clinical trials in which there may be a delayed treatment effect. Any such delay takes us outside the umbrella of a proportional hazards structure and therefore outside the setting in which the log‐rank test would be optimal. The approach...
Comparing Kaplan-Meier curves - what are the (SAS) options?Rob Allis, Amgen Ltd., Uxbridge, UK ABSTRACT In survival analysis the log rank test is commonly used to compare the Kaplan-Meier curves of two treatments. Part of our role is to provide the SAS® code to perform the log rank ...
Unadjusted Kaplan-Meier curves were generated to estimate the overall survival and bladder cancer–specific survival for trimodal therapy and radical cystectomy. A Cox proportional hazards regression model was used to assess the association of treatment with overall survival. In the Cox model, we used...
There were no differences in Kaplan–Meier curves of overall and disease-free survival between the two groups (Fig. 1). Table 5 Comparison of oncological outcomes in elderly patients with periampullary tumours in the LPD and OPD groups. Full size table Figure 1 Comparison of Kaplan–Meier ...
OS was evaluated using Kaplan-Meier curves with log-rank test and Cox proportional hazards regression model.ResultsThe Kaplan-Meier analysis revealed that stratification of patients in DC vs. DP according to mRECIST (p = 0.0371) and vqEASL (p = 0.0118) successfully captured response and ...
There were no differences in Kaplan–Meier curves of overall and disease-free survival between the two groups (Fig. 1). Discussion Populations are aging worldwide, with individuals living longer and the surgical needs of elderly patients increas- ing. In particular, elderly patients show higher...
Many nonparametric tests based on the Kaplan-Meier estimator for survival curves [1], 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 [2]. In addition, Efron proposed a test ...
difference between the population survival curves (i.e. the probability of an event occurring at any time point is the same for each population). This function uses the Kaplan-Meier procedure to estimate the survival function (KMPLOT), so if it misses, logrank will try to download it from...
Kaplan-Meier survival curves of two families of Crassostrea gigas during infection with OsHV-1. For the third experiment, one tank was used (n = 20). For the two families, 100% of survival was reported among negative controls injected with 100 μL of artificial seawater. Full size ima...