Cox比例风险模型是生物医学研究中常用的生存分析方法 ,应用范围非常广泛。但能否用 Cox比例风险模型拟合某数据 ,模型的拟合优度如何 ,实际工作者考虑较少。考察 Cox比例风险模型拟合优度最为常用的方法是图示法。图示法是将研究对象按预后指数恰当分组 ,用 Kaplan- meier法估 The Cox proportional hazards model is a commonly used method of survival analysis in biomedical research and has a wide range of applications. However, Cox proportional hazards model can be used to fit a data model, the goodness of fit of the model, the actual worker to consider less. The most commonly used method to examine the goodness of fit of the Cox proportional hazards model is the graphical method. The notation is to group subjects according to the prognostic index, using the Kaplan-Meier method