Methods Simulation data,propensity score methods (PSM) were conducted to assess bias and efficiency,under both with/without model misspecification conditions.

• 方法利用计算机模拟对倾向指数方法在无模型误定和有模型误定情况下的偏度和精度进行分析,并与基于模型方法的模拟结果进行比较。