小的看paper 可是英文太差 查了字典还是不通0rz 希望会的大大帮忙说一下在讲什麽 主要是第一段waist(腰部)不知道那边再说什麽@@ elite troops(精英部队@@??) A simple univariate example of such a phenomenon involves the distribution of waist sizes for uniforms of elite troops who are selected only if they meet a specific minimal height requirement. A classical bivariate normal model might well be acceptable for the joint distribution of height and waist measurements. However, imposition of the height restriction will result in a positively skewed distribution for the waist sizes of the selected individuals, 谢谢~ --

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