【摘要】 [目的]介绍样本选择模型及其估计方法。[方法]应用样本选择模型对模拟数据进行分析,并与传统线性回归模型进行比较。[结果]对于特定条件下的缺失数据,样本选择模型比传统的线性回归模型更合理,并可以提高模型参数估计的效率。[结论]样本选择模型在医学研究中拥有广泛的应用前景。更多还原

【Abstract】 [Objective] To introduce sample selection model and its estimation method.[Methods] The missing data were analysed with sample selection model and compared with traditional linear regression model.[Results] When missing da-ta had special structure,sample selection model was more sensible and efficient compared with traditional linear regression model.[Conclusion] The sample selection model has good applicability to medical research.更多还原