Objective Propose a method that combines the propensity score approach and non-parametric survival analysis for hazard ratioestimation in non-randomized medical researches.
目的提出一种适用于非随机化医学研究的，结合倾向指数与非参数生存分析估计风险比的方法。
2
Implementation of the scheme has resolved the problems on difficult hydrogen nitrogen ratioestimation and difficult control, it has apparent economic and social benefit and worth extend.