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The triple difference estimator
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DOI：10.1093/ectj/utac010.png)
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摘要
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Triple difference has become a widely used estimator in empirical work. A close reading of articles in top economics journals reveals that the use of the estimator to a large extent rests on intuition. The identifying assumptions are neither formally derived nor generally agreed on. We give a complete presentation of the triple difference estimator, and show that even though the estimator can be computed as the difference between two difference-in-differences estimators, it does not require two parallel trend assumptions to have a causal interpretation. The reason is that the difference between two biased difference-in-differences estimators will be unbiased as long as the bias is the same in both estimators. This requires only one parallel trend assumption to hold.
Keyword:
DD
DDD
DID
DiDiD
difference-in-difference-in-differences
difference-in-differences
parallel trend assumption
triple difference
期刊
IF:
7
论文数:
565
被引数:
2.3K
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引用论文
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