...美国统计学家罗森邦和鲁宾提出了一种便捷有效的方法，就是把所有的背景变量信息汇总为一个单一的“倾向得分”(Propensity Score)，然后根据“倾向得分”值来从B组中抽取与A组配对的BM组。
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我们没发现处理倾向得分理论中具备稳健的假设。
We do not find the implied theoretical assumptions underlying propensity scores to be attractive or robust.
本文提出的方法有助于在处理倾向得分和其它匹配问题，并揭示它们的优点和缺点。
The proposed method helps place propensity scores and other matching proposals in context and reveals their advantages and disadvantages.
IQ测试中得分较高的人不太倾向于抽烟或大量饮酒，他们有更好的饮食习惯，而且更注意锻炼身体。
People with higher IQ test scores tend to be less likely to smoke or drink alcohol heavily, they eat better diets, and they are more physically active.
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