目的评价由倾向指数方法得到的暴露效果的估计量和统计性质，并探讨其实用性。
Objective to evaluate the statistical property of the estimators on exposure effect and value of propensity score methods in practical use.
对于需要通过抽样调查获得数据的统计指标，简要讨论抽取样本和构造估计量的方案。
As for those statistical indicators needed to use sample survey to attain data this article discusses program of drawing sample and constructing estimator simply.
在平均值为零或平均值为已知的季节时间序列模型中，根据加权对称估计量提出季节单位根的检验统计量，并求出此统计量的极限分布的表达式。
In this article, we propose seasonal unit root test statistics based on the Weighted Symmetric estimator and derive representation for limiting distributions of the statistics.
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