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On the identification of the effect of prohibiting hand-held cell phone use while driving: Comment

机译:关于禁止开车时使用手持手机的效果的鉴定:评论

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In a paper recently published in this journal (Nikolaev, A.G., Robbins, M.J., Jacobson, S.H., 2010. Evaluating the impact of legislation prohibiting hand-held cell phone use while driving. Transportation Research Part A 44,182-193.), Nikolaev et al. (2010) provide evidences on the effect of hand-held cell phone bans on driving safety. More specifically, they analyze the impact of a state-wide ban on hand-held cell phone use while driving on the number of fatal automobile and personal injury accidents per 100,000 licensed drivers per year and conclude that the ban had a significant negative impact on both the mean fatal accident rate and the mean personal injury accident rate. In this paper I argue that they lack of a good identification strategy that enables them to correctly identify the causal effect of the ban. I also provide evidence that the effect they find is a combination of the ban effect and of unobservable variables not accounted for in their analysis. Finally, I provide a way where one can control for unobservables when estimating the causal effect of the ban and find that indeed that ban appears to have a negative effect on fatal automobile accidents.
机译:在最近发表在该杂志上的一篇论文中(尼古拉耶夫(Nikolaev,AG),罗宾斯(Rubbins),密歇根州,雅各布森(Jacobson),2010年。评估禁止驾驶时使用手持手机的法规的影响。交通研究A部分44,182-193。),尼古拉耶夫(Nikolaev)等等(2010年)提供了有关手持手机禁令对行车安全的影响的证据。更具体地说,他们分析了全州禁止驾驶时使用手提电话对每年每100,000名持照驾驶员造成的致命汽车和人身伤害事故的数量的影响,并得出结论,该禁令对双方都产生了重大负面影响平均致命事故率和平均人身伤害事故率。在本文中,我认为他们缺乏良好的识别策略,无法正确识别禁令的因果关系。我还提供了证据,表明他们发现的影响是禁令影响和分析中未考虑的不可观察变量的组合。最后,我提供了一种方法,可以在评估禁令的因果关系时控制无法观察的事物,并发现该禁令确实对致命的汽车事故具有负面影响。

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