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Comment
. 2023 Jun;79(2):587-591.
doi: 10.1111/biom.13781. Epub 2022 Nov 30.

Discussion on "Instrumented difference-in-differences" by Ye, Ertefaie, Flory, Hennessy, Small

Zhiqiang Tan  1
Affiliations
Comment

Discussion on "Instrumented difference-in-differences" by Ye, Ertefaie, Flory, Hennessy, Small

Zhiqiang Tan. Biometrics. 2023 Jun.

Abstract

Ye, Ertefaie, Flory, Hennessy, and Small (YEFHS) proposed a new method, instrumented difference-in-differences, for dealing with unmeasured confounding. In this note, I connect and compare assumptions and identifications in instrumental variable (IV) and difference-in-differences (DID) methods with those in YEFHS, derive new identification results, and discuss different choices when extending such results to adjust for covariates.

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Comment on

  • Instrumented difference-in-differences.
    Ye T, Ertefaie A, Flory J, Hennessy S, Small DS. Ye T, et al. Biometrics. 2023 Jun;79(2):569-581. doi: 10.1111/biom.13783. Epub 2022 Nov 9. Biometrics. 2023. PMID: 36305081 Free PMC article.

References

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