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Profiling Compliers and Noncompliers for Instrumental-Variable Analysis

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  • Marbach, Moritz
  • Hangartner, Dominik

Abstract

Instrumental-variable (IV) estimation is an essential method for applied researchers across the social and behavioral sciences who analyze randomized control trials marred by noncompliance or leverage partially exogenous treatment variation in observational studies. The potential outcome framework is a popular model to motivate the assumptions underlying the identification of the local average treatment effect (LATE) and to stratify the sample into compliers, always-takers, and never-takers. However, applied research has thus far paid little attention to the characteristics of compliers and noncompliers. Yet, profiling compliers and noncompliers is necessary to understand what subpopulation the researcher is making inferences about and an important first step in evaluating the external validity (or lack thereof) of the LATE estimated for compliers. In this letter, we discuss the assumptions necessary for profiling, which are weaker than the assumptions necessary for identifying the LATE if the instrument is randomly assigned. We introduce a simple and general method to characterize compliers, always-takers, and never-takers in terms of their covariates and provide easy-to-use software in R and STATA that implements our estimator. We hope that our method and software facilitate the profiling of compliers and noncompliers as a standard practice accompanying any IV analysis.

Suggested Citation

  • Marbach, Moritz & Hangartner, Dominik, 2020. "Profiling Compliers and Noncompliers for Instrumental-Variable Analysis," Political Analysis, Cambridge University Press, vol. 28(3), pages 435-444, July.
  • Handle: RePEc:cup:polals:v:28:y:2020:i:3:p:435-444_8
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    Cited by:

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    3. Apoorva Lal & Mac Lockhart & Yiqing Xu & Ziwen Zu, 2023. "How Much Should We Trust Instrumental Variable Estimates in Political Science? Practical Advice Based on Over 60 Replicated Studies," Papers 2303.11399, arXiv.org, revised Nov 2023.
    4. Hardt, David & Nagler, Markus & Rincke, Johannes, 2022. "Can peer mentoring improve online teaching effectiveness? An RCT during the COVID-19 pandemic," Labour Economics, Elsevier, vol. 78(C).
    5. Galofré-Vilà, Gregori, 2023. "Spoils of War: The Political Legacy of the German hyperinflation," Explorations in Economic History, Elsevier, vol. 88(C).
    6. Humlum, Maria Knoth & Morthorst, Marius Opstrup & Thingholm, Peter Rønø, 2022. "Sibling Spillovers and the Choice to Get Vaccinated: Evidence from a Regression Discontinuity Design," IZA Discussion Papers 15109, Institute of Labor Economics (IZA).
    7. Sofia Amaral & Gordon B. Dahl & Victoria Endl-Geyer & Timo Hener & Helmut Rainer, 2023. "Deterrence or Backlash? Arrests and the Dynamics of Domestic Violence," NBER Working Papers 30855, National Bureau of Economic Research, Inc.
    8. Amarasinghe, Ashani, 2022. "Diverting domestic turmoil," Journal of Public Economics, Elsevier, vol. 208(C).
    9. Merida, Adrian L. & Rocha, Vera, 2021. "It's about time: The timing of entrepreneurial experience and the career dynamics of university graduates," Research Policy, Elsevier, vol. 50(1).
    10. Ana Maria Diaz & Luz Magdalena Salas, 2022. "Pretrial detention and conviction," European Journal of Law and Economics, Springer, vol. 53(1), pages 1-25, February.
    11. Takaku, Reo & Yokoyama, Izumi, 2022. "The financial health of “swing hospitals” during the first COVID-19 outbreak," Journal of the Japanese and International Economies, Elsevier, vol. 65(C).
    12. Hans-Joachim Voth & Bruno Caprettini & Alex Trew, 2022. "Fighting for Growth: Labor scarcity and technological progress during the British industrial revolution," Working Papers 2022_15, Business School - Economics, University of Glasgow.
    13. Austen, Siobhan & Kalsi, Jaslin Kaur & Mavisakalyan, Astghik, 2022. "Retirement and the distribution of intra-household wellbeing," The Journal of the Economics of Ageing, Elsevier, vol. 23(C).
    14. Budría, Santiago & Martínez-de-Ibarreta, Carlos, 2021. "Education and skill mismatches among immigrants: The impact of host language proficiency," Economics of Education Review, Elsevier, vol. 84(C).
    15. Haiyue Yu & Jin Cao & Shulong Kang, 2023. "Fertility cost, grandparental childcare, and female employment," Empirical Economics, Springer, vol. 64(3), pages 1067-1104, March.
    16. Mecheva, Margarita de Vries & Rieger, Matthias & Sparrow, Robert & Prafiantini, Erfi & Agustina, Rina, 2021. "Snacks, nudges and asymmetric peer influence: Evidence from food choice experiments with children in Indonesia," Journal of Health Economics, Elsevier, vol. 79(C).
    17. Oyenubi, Adeola & Kollamparambil, Umakrishnan, 2022. "Does the child support grant incentivise childbirth in South Africa?," Economic Analysis and Policy, Elsevier, vol. 73(C), pages 812-825.
    18. Kadir Atalay & Garry Barrett, 2022. "Retirement routes and the well-being of retirees," Empirical Economics, Springer, vol. 63(5), pages 2751-2784, November.
    19. Matthew L. Comey & Amanda R. Eng & Zhuan Pei, 2022. "Supercompliers," Papers 2212.14105, arXiv.org, revised Aug 2023.

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