| 来源类型 | Working Paper |
| 规范类型 | 报告 |
| DOI | 10.3386/w29550 |
| 来源ID | Working Paper 29550 |
| Researchers' Degrees-of-Flexibility and the Credibility of Difference-in-Differences Estimates: Evidence From the Pandemic Policy Evaluations | |
| Joakim A. Weill; Matthieu Stigler; Olivier Deschenes; Michael R. Springborn | |
| 发表日期 | 2021-12-06 |
| 出版年 | 2021 |
| 语种 | 英语 |
| 摘要 | The COVID-19 pandemic brought unprecedented policy responses and a large literature evaluating their impacts. This paper re-examines this literature and investigates the role of researchers' degrees-of-flexibility on the estimated effects of mobility-reducing policies on social-distancing behavior. We find that two-way fixed effects estimates are not robust to minor changes in usually-unexplored dimensions of the degree-of-flexibility space. While standard robustness tests based on the sequential addition of covariates are very stable, small changes in the outcome variable and its transformation lead to large and sometimes contradictory changes in the estimates, where the same policy can be found to significantly increase or decrease mobility. Yet, due to the large number of degrees-of-flexibility, one can focus on a set of results that appears stable, while ignoring problematic ones. We show that recently developed heterogeneity-robust difference-in-differences estimators only partially mitigate these issues, and discuss how a strategy of identifying the point at which a sequence of ever more-stringent robustness tests eventually fail could increase the credibility of policy evaluations. |
| 主题 | Econometrics ; Estimation Methods ; Subnational Fiscal Issues ; Health, Education, and Welfare ; Health ; COVID-19 |
| URL | https://www.nber.org/papers/w29550 |
| 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/587224 |
| 推荐引用方式 GB/T 7714 | Joakim A. Weill,Matthieu Stigler,Olivier Deschenes,et al. Researchers' Degrees-of-Flexibility and the Credibility of Difference-in-Differences Estimates: Evidence From the Pandemic Policy Evaluations. 2021. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 资源类型 | 版本类型 | 开放类型 | 使用许可 | ||
| w29550.pdf（2827KB） | 智库出版物 | 限制开放 | CC BY-NC-SA | 浏览 | ||
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