A longitudinal study of Chicago adolescents has concluded that even a single exposure to firearm violence doubles the chance that a young person will later engage in violent behavior. The study may once again stoke up the debate over juvenile violence; it has already triggered criticism over the unusual statistical method it employs. The work is part of the decade-old Project on Human Development in Chicago Neighborhoods, run by Harvard University psychiatrist Felton J. Earls. On page 1323, Earls and two health statisticians describe how they used a relatively new technique called "propensity score stratification" to create, through statistical means, a randomized experiment on propensity toward violence from observational data.
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机译：对芝加哥青少年的纵向研究得出的结论是，即使一次接触枪支暴力，年轻人以后进行暴力行为的机会也会加倍。该研究可能会再次引发有关少年暴力的辩论；它已经对其使用的非常规统计方法引发了批评。这项工作是由哈佛大学精神病学家费尔顿·J·厄尔斯（Felton J. Earls）主持的十年来芝加哥社区人类发展项目的一部分。在1323页上，伯爵和两名健康统计学家描述了他们如何使用一种相对较新的技术，即“倾向得分分层”，通过统计手段从观察数据中创建关于暴力倾向的随机实验。
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