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Treatment effect identification using alternative parallel assumptions

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  • Mora, Ricardo
  • Reggio, Iliana

Abstract

The core assumption to identify the treatment effect in difference-in-differences estimators is the so-called Parallel Paths assumption, namely that the average change in outcome for the treated in the absence of treatment equals the average change in outcome for the non-treated. We define a family of alternative Parallel assumptions and show for a number of frequently used empirical specifications which parameters of the model identify the treatment effect under the alternative Parallel assumptions. We further propose a fully flexible model which has two desirable features not present in the usual econometric specifications implemented in applied research. First, it allows for flexible dynamics and for testing restrictions on these dynamics. Second, it does not impose equivalence between alternative Parallel assumptions. We illustrate the usefulness of our approach by revising the results of several recent papers in which the difference-in-differences technique has been applied.The core assumption to identify the treatment effect in difference-in-differences estimators is the so-called Parallel Paths assumption, namely that the average change in outcome for the treated in the absence of treatment equals the average change in outcome for the non-treated. We define a family of alternative Parallel assumptions and show for a number of frequently used empirical specifications which parameters of the model identify the treatment effect under the alternative Parallel assumptions. We further propose a fully flexible model which has two desirable features not present in the usual econometric specifications implemented in applied research. First, it allows for flexible dynamics and for testing restrictions on these dynamics. Second, it does not impose equivalence between alternative Parallel assumptions. We illustrate the usefulness of our approach by revising the results of several recent papers in which the difference-in-differences technique has been applied

Suggested Citation

  • Mora, Ricardo & Reggio, Iliana, 2012. "Treatment effect identification using alternative parallel assumptions," UC3M Working papers. Economics we1233, Universidad Carlos III de Madrid. Departamento de Economía.
    • Handle: RePEc:cte:werepe:we1233
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    1. Philip de Jong & Maarten Lindeboom & Bas van der Klaauw, 2011. "Screening Disability Insurance Applications," Journal of the European Economic Association, European Economic Association, vol. 9(1), pages 106-129, February.
    2. Stephen J. Redding & Daniel M. Sturm & Nikolaus Wolf, 2011. "History and Industry Location: Evidence from German Airports," The Review of Economics and Statistics, MIT Press, vol. 93(3), pages 814-831, August.
    3. Daniel Aaronson & Bhashkar Mazumder, 2011. "The Impact of Rosenwald Schools on Black Achievement," Journal of Political Economy, University of Chicago Press, vol. 119(5), pages 821-888.
    4. Stéphane Bonhomme & Ulrich Sauder, 2011. "Recovering Distributions in Difference-in-Differences Models: A Comparison of Selective and Comprehensive Schooling," The Review of Economics and Statistics, MIT Press, vol. 93(2), pages 479-494, May.
    5. Ran Abramitzky & Adeline Delavande & Luis Vasconcelos, 2011. "Marrying Up: The Role of Sex Ratio in Assortative Matching," American Economic Journal: Applied Economics, American Economic Association, vol. 3(3), pages 124-157, July.
    6. Leora Friedberg, 1998. "Did Unilateral Divorce Raise Divorce Rates? Evidence from Panel Data," NBER Working Papers 6398, National Bureau of Economic Research, Inc.
    7. Seema Jayachandran & Adriana Lleras-Muney & Kimberly V. Smith, 2010. "Modern Medicine and the Twentieth Century Decline in Mortality: Evidence on the Impact of Sulfa Drugs," American Economic Journal: Applied Economics, American Economic Association, vol. 2(2), pages 118-146, April.
    8. Petra Moser & Alessandra Voena, 2012. "Compulsory Licensing: Evidence from the Trading with the Enemy Act," American Economic Review, American Economic Association, vol. 102(1), pages 396-427, February.
    9. Janet Currie & Reed Walker, 2011. "Traffic Congestion and Infant Health: Evidence from E-ZPass," American Economic Journal: Applied Economics, American Economic Association, vol. 3(1), pages 65-90, January.
    10. Jeffrey A. Groen & Anne E. Polivka, 2008. "The Effect of Hurricane Katrina on the Labor Market Outcomes of Evacuees," American Economic Review, American Economic Association, vol. 98(2), pages 43-48, May.
    11. Angrist, Joshua D. & Krueger, Alan B., 1999. "Empirical strategies in labor economics," Handbook of Labor Economics, in: O. Ashenfelter & D. Card (ed.), Handbook of Labor Economics, edition 1, volume 3, chapter 23, pages 1277-1366, Elsevier.
    12. Jeffrey L. Furman & Scott Stern, 2011. "Climbing atop the Shoulders of Giants: The Impact of Institutions on Cumulative Research," American Economic Review, American Economic Association, vol. 101(5), pages 1933-1963, August.
    13. Richard Blundell & Monica Costa Dias & Costas Meghir & John Van Reenen, 2004. "Evaluating the Employment Impact of a Mandatory Job Search Program," Journal of the European Economic Association, MIT Press, vol. 2(4), pages 569-606, June.
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