全球智库信息集成服务系统(G2TT): The Promise and Pitfalls of Differences-in-Differences: Reflections on \u201816 and Pregnant\u2019 and Other Applications

G2TT

来源类型	Working Paper
规范类型	报告
DOI	10.3386/w24857
来源ID	Working Paper 24857
	The Promise and Pitfalls of Differences-in-Differences: Reflections on \u201816 and Pregnant\u2019 and Other Applications
	Ariella Kahn-Lang; Kevin Lang
发表日期	2018-07-23
出版年	2018
语种	英语
摘要	We use the exchange between Kearney/Levine and Jaeger/Joyce/Kaestner on “16 and Pregnant” to reexamine the use of DiD as a response to the failure of nature to properly design an experiment for us. We argue that 1) any DiD paper should address why the original levels of the experimental and control groups differed, and why this would not impact trends, 2) the parallel trends argument requires a justification of the chosen functional form and that the use of the interaction coefficients in probit and logit may be justified in some cases, and 3) parallel trends in the period prior to treatment is suggestive of counterfactual parallel trends, but parallel pre-trends is neither necessary nor sufficient for the parallel counterfactual trends condition to hold. Importantly, the purely statistical approach uses pretesting and thus generates the wrong standard errors. Moreover, we underline the dangers of implicitly or explicitly accepting the null hypothesis when failing to reject the absence of a differential pre-trend.
主题	Econometrics ; Estimation Methods ; Labor Economics ; Demography and Aging
URL	https://www.nber.org/papers/w24857
来源智库	National Bureau of Economic Research (United States)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/582531
推荐引用方式 GB/T 7714	Ariella Kahn-Lang,Kevin Lang. The Promise and Pitfalls of Differences-in-Differences: Reflections on \u201816 and Pregnant\u2019 and Other Applications. 2018.

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w24857.pdf（286KB）	智库出版物		限制开放	CC BY-NC-SA	浏览