一、引言:生存分析是医学研究中经常使用的统计方法,应用目的主要在于研究一组变量(危险因子)与观察结果之间的关系,观察结果通称失效(Failure)可以是发病、死亡等事件。传统的生存分析包括简略寿命表、列联表、方差分析等,它们在应用时均有很大的限制。主要困难有二点,首先是实际资料中经常出现的:因 I. INTRODUCTION: Survival analysis is a statistical method often used in medical research. The purpose of application is mainly to study the relationship between a group of variables (risk factors) and observation results. The observation result can be the onset, death, etc. . Traditional survival analysis includes short life tables, contingency tables, analysis of variance, etc., all of which are very limited in their application. There are two main difficulties, first of all in the actual data: