セミナーシリーズ
応用ミクロ経済学セミナー(2024.9.20)(京都大学経済研究所 計量経済学セミナーとの共催)
石丸 翔也(一橋大学大学院経済学研究科 講師)
- 開催日:
- 2024年9月20日(金)10:30-12:00
- 場所:
- 京都大学 吉田キャンパス 法経済学部東館2階 201演習室
- 言語:
- 英語
- コーディネーター:
- 山田 憲・柳 貴英
タイトル:
“What Do We Get from Two-Way Fixed Effects Regressions? Implications from Numerical Equivalence”
Abstract:
In any multiperiod panel, a two-way fixed effects (TWFE) regression is numerically equivalent to a first-difference (FD) regression that pools all possible between-period gaps. Building on this observation, this paper develops numerical and causal interpretations of the TWFE coefficient. At the sample level, the TWFE coefficient is a weighted average of FD coefficients with different between-period gaps. This decomposition is useful for assessing the source of identifying variation for the TWFE coefficient. At the population level, a causal interpretation of the TWFE coefficient requires a common trends assumption for any between-period gap, and the assumption has to be conditional on changes in time-varying covariates. I propose a natural generalization of the TWFE estimator that can relax these requirements.
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