A censored quantile regression approach for the analysis of time to event data.
The commonly used statistical model for studying time to event data, the Cox proportional hazards model, is limited by the assumption of a constant hazard ratio over time (i.e., proportionality), and the fact that it models the hazard rate rather than the survival time directly. The censored quantile regression model, defined on the quantiles of time to event, provides an alternative that is more flexible and interpretable. However, the censored quantile regression model has not been widely adopted in clinical research, due to the complexity involved in interpreting its results properly and consequently the difficulty to appreciate its advantages over the Cox proportional hazards model, as well as the absence of adequate validation procedure. In this paper, we addressed these limitations by (1) using both simulated examples and data from National Wilms' Tumor clinical trials to illustrate proper interpretation of the censored quantile regression model and the differences and the advantages of the model compared to the Cox proportional hazards model; and (2) developing a validation procedure for the predictive censored quantile regression model. The performance of this procedure was examined using simulation studies. Overall, we recommend the use of censored quantile regression model, which permits a more sensitive analysis of time to event data together with the Cox proportional hazards model.
['Xue|Xiaonan|X|', 'Xie|Xianhong|X|', 'Strickler|Howard D|HD|']
D056808:Biostatistics D002648:Child D003198:Computer Simulation D006801:Humans D053208:Kaplan-Meier Estimate D007680:Kidney Neoplasms D015233:Models, Statistical D009364:Neoplasm Recurrence, Local D016016:Proportional Hazards Models D012044:Regression Analysis D013997:Time Factors D009396:Wilms Tumor
quantile hazards ratio Proportionality validation prediction accelerated failure time model cross-validation