五、稳健性检验——基于倾向得分的方法 由于参军是一个自我选择（self-selected）的行为，所以可能存在劳动力自身的一些不可 观测的因素同时影响其参军决策以及收入。
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Zhong-han Wang's Self-selected Academic Works 王钟翰学术论着自选集
self-selected path 自选路径
self-selected diets 自订食谱
A problem with both these studies is that participants in both groups were self-selected.
这些研究的共同问题在于两组的参与者都是自我选择的。
One group of teens ate self-selected low-calorie meals not exceeding 1,300 to 1,500 total calories per day.
一组肥胖少年采用自选的低卡路里餐，每天摄入的卡路里总量不超过1300至1500。
Study limitations included the observational nature of the study and the fact that aspirin use was self-selected.
研究的范围包括研究的观察本质和阿斯匹林的使用是自我选择的事实。
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