Difference-in-Differences Estimators of Intertemporal Treatment Effects
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2020
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| _version_ | 1866911672370724864 |
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| author | de Chaisemartin, Clément D'Haultfœuille, Xavier |
| author_facet | de Chaisemartin, Clément D'Haultfœuille, Xavier |
| contents | We study treatment-effect estimation using panel data. The treatment may be non-binary, non-absorbing, and the outcome may be affected by treatment lags. We make a parallel-trends assumption, and propose event-study estimators of the effect of being exposed to a weakly higher treatment dose for $\ell$ periods. We also propose normalized estimators, that estimate a weighted average of the effects of the current treatment and its lags. We also analyze commonly-used two-way fixed-effects regressions. Unlike our estimators, they can be biased in the presence of heterogeneous treatment effects. A local-projection version of those regressions is biased even with homogeneous effects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2007_04267 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Difference-in-Differences Estimators of Intertemporal Treatment Effects de Chaisemartin, Clément D'Haultfœuille, Xavier Econometrics We study treatment-effect estimation using panel data. The treatment may be non-binary, non-absorbing, and the outcome may be affected by treatment lags. We make a parallel-trends assumption, and propose event-study estimators of the effect of being exposed to a weakly higher treatment dose for $\ell$ periods. We also propose normalized estimators, that estimate a weighted average of the effects of the current treatment and its lags. We also analyze commonly-used two-way fixed-effects regressions. Unlike our estimators, they can be biased in the presence of heterogeneous treatment effects. A local-projection version of those regressions is biased even with homogeneous effects. |
| title | Difference-in-Differences Estimators of Intertemporal Treatment Effects |
| topic | Econometrics |
| url | https://arxiv.org/abs/2007.04267 |