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A Primer for Applying Propensity-Score Matching

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  • Carolyn Heinrich

    ()

  • Alessandro Maffioli

    ()

  • Gonzalo Vázquez

    ()

Abstract

The use of microeconometric techniques to estimate the effects of development policies has become a common approach not only for scholars, but also for policy-makers engaged in designing, implementing and evaluating projects in different fields. Among these techniques, Propensity-Score Matching (PSM) is increasingly applied in the policy evaluation community. This technical note provides a guide to the key aspects of implementing PSM methodology for an audience of practitioners interested in understanding its applicability to specific evaluation problems. The note summarizes the basic conditions under which PSM can be used to estimate the impact of a program and the data required. It explains how the Conditional Independence Assumption, combined with the Overlap Condition, reduces selection bias when participation in a program is determined by observable characteristics. It also describes different matching algorithms and some tests to assess the quality of the matching. Case studies are used throughout to illustrate important concepts in impact evaluation and PSM. In the annexes, the note provides an outline of the main technical aspects and a list of statistical and econometric software for implementing PSM.

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Bibliographic Info

Paper provided by Inter-American Development Bank, Office of Strategic Planning and Development Effectiveness (SPD) in its series SPD Working Papers with number 1005.

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Date of creation: Aug 2010
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Handle: RePEc:idb:spdwps:1005

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Keywords: Policy Evaluation; Microeconometrics; Propensity-Score Matching; Average Treatment Effect on the Treated; Development Effectiveness;

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References

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  1. Almus, Matthias & Czarnitzki, Dirk, 2001. "The effects of public R&D subsidies on firms' innovation activities: the case of Eastern Germany," ZEW Discussion Papers 01-10, ZEW - Zentrum für Europäische Wirtschaftsforschung / Center for European Economic Research.
  2. Petra Moser, 2005. "How Do Patent Laws Influence Innovation? Evidence from Nineteenth-Century World's Fairs," American Economic Review, American Economic Association, vol. 95(4), pages 1214-1236, September.
  3. Jorge M. Agüero & Michael R. Carter & Ingrid Woolard, 2007. "The Impact of Unconditional Cash Transfers on Nutrition: The South African Child Support Grant," Working Papers 39, International Policy Centre for Inclusive Growth.
  4. Sebastian Galiani & Paul Gertler & Ernesto Schargrodsky, 2002. "Water for Life: The Impact of the Privatization of Water Services on Child Mortality," Working Papers 54, Universidad de San Andres, Departamento de Economia, revised Sep 2005.
  5. Jeffrey Smith & Petra Todd, 2003. "Does Matching Overcome Lalonde's Critique of Nonexperimental Estimators?," University of Western Ontario, CIBC Centre for Human Capital and Productivity Working Papers 20035, University of Western Ontario, CIBC Centre for Human Capital and Productivity.
  6. Kosuke Imai & David A. van Dyk, 2004. "Causal Inference With General Treatment Regimes: Generalizing the Propensity Score," Journal of the American Statistical Association, American Statistical Association, vol. 99, pages 854-866, January.
  7. Torsten Persson & Guido Tabellini & Francesco Trebbi, . "Electoral Rules and Corruption," Working Papers 182, IGIER (Innocenzo Gasparini Institute for Economic Research), Bocconi University.
  8. Black, Dan A. & Smith, J.A.Jeffrey A., 2004. "How robust is the evidence on the effects of college quality? Evidence from matching," Journal of Econometrics, Elsevier, vol. 121(1-2), pages 99-124.
  9. Imbens, Guido & Abadie, Alberto, 2008. "On the Failure of the Bootstrap for Matching Estimators," Scholarly Articles 3043415, Harvard University Department of Economics.
  10. Heckman, James J & Ichimura, Hidehiko & Todd, Petra, 1998. "Matching as an Econometric Evaluation Estimator," Review of Economic Studies, Wiley Blackwell, vol. 65(2), pages 261-94, April.
  11. Alfonso Flores-Lagunes & Arturo Gonzalez & Todd C. Neumann, 2007. "Estimating the Effects of Length of Exposure to a Training Program: The Case of Job Corps," Working Papers 1042, Princeton University, Department of Economics, Industrial Relations Section..
  12. Alberto Abadie & David Drukker & Jane Leber Herr & Guido W. Imbens, 2004. "Implementing matching estimators for average treatment effects in Stata," Stata Journal, StataCorp LP, vol. 4(3), pages 290-311, September.
  13. Marco Caliendo & Sabine Kopeinig, 2005. "Some Practical Guidance for the Implementation of Propensity Score Matching," Discussion Papers of DIW Berlin 485, DIW Berlin, German Institute for Economic Research.
  14. Jalan, Jyotsna & Ravallion, Martin, 2003. "Estimating the Benefit Incidence of an Antipoverty Program by Propensity-Score Matching," Journal of Business & Economic Statistics, American Statistical Association, vol. 21(1), pages 19-30, January.
  15. Victor Lavy, 2002. "Evaluating the Effect of Teachers' Group Performance Incentives on Pupil Achievement," Journal of Political Economy, University of Chicago Press, vol. 110(6), pages 1286-1317, December.
  16. Alberto Abadie & Guido W. Imbens, 2006. "Large Sample Properties of Matching Estimators for Average Treatment Effects," Econometrica, Econometric Society, vol. 74(1), pages 235-267, 01.
  17. Sascha O. Becker & Andrea Ichino, 2002. "Estimation of average treatment effects based on propensity scores," Stata Journal, StataCorp LP, vol. 2(4), pages 358-377, November.
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Cited by:
  1. Gustavo A. Crespi & Alessandro Maffioli & Pierre Mohnen & Gonzalo Vázquez, 2011. "Evaluating the Impact of Science, Technology and Innovation Programs: a Methodological Toolkit," SPD Working Papers 1104, Inter-American Development Bank, Office of Strategic Planning and Development Effectiveness (SPD).
  2. Paul Winters & Lina Salazar & Alessandro Maffioli, 2010. "Designing Impact Evaluations for Agricultural Projects," SPD Working Papers 1007, Inter-American Development Bank, Office of Strategic Planning and Development Effectiveness (SPD).
  3. Maria S. Floro & Javier Bronfman, 2012. "How Well have Social Protection Schemes in Chile Reduced Household Vulnerability?," Working Papers 2012-03, American University, Department of Economics.
  4. Solomon Asfaw & Silvio Daidone & Benjamin Davis & Josh Dewbre & Alessandro Romeo & Paul Winters & Katia Covarrubias & Habiba Djebbari, 2012. "Analytical Framework for Evaluating the Productive Impact of Cash Transfer Programmes on Household Behaviour ? Methodological Guidelines for the From Protection to Production Project," Working Papers 101, International Policy Centre for Inclusive Growth.

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