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Timing and Duration of Exposure in Evaluations of Social Programs

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  • Elizabeth M. King
  • Jere R. Behrman

Abstract

Impact evaluations aim to measure the outcomes that can be attributed to a specific policy or intervention. While there have been excellent reviews of the different methods for estimating impact, insufficient attention has been paid to questions related to timing: How long after a program has begun should it be evaluated? For how long should treatment groups be exposed to a program before they benefit from it? Are there time patterns in a program's impact? This paper examines the evaluation issues related to timing, and discusses the sources of variation in the duration of exposure within programs and their implications for impact estimates. It reviews the evidence from careful evaluations of programs (with a focus on developing countries) on the ways that duration affects impacts. Copyright The Author 2009. Published by Oxford University Press on behalf of the International Bank for Reconstruction and Development / the world bank . All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org, Oxford University Press.

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Bibliographic Info

Article provided by World Bank Group in its journal The World Bank Research Observer.

Volume (Year): 24 (2009)
Issue (Month): 1 (February)
Pages: 55-82

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Handle: RePEc:oup:wbrobs:v:24:y:2009:i:1:p:55-82

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Citations

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Cited by:
  1. Lant Pritchett & Salimah Samji & Jeffrey Hammer, 2012. "It‘s All About MeE: Using Structured Experiential Learning ('e') to Crawl the Design Space," Working Papers 1399, Princeton University, Woodrow Wilson School of Public and International Affairs, Research Program in Development Studies..
  2. Lamarche, Carlos, 2011. "Measuring the incentives to learn in Colombia using new quantile regression approaches," Journal of Development Economics, Elsevier, vol. 96(2), pages 278-288, November.
  3. Agnes Quisumbing & Bob Baulch & Neha Kumar, 2011. "Evaluating the long-term impact of anti-poverty interventions in Bangladesh: an overview," Journal of Development Effectiveness, Taylor & Francis Journals, vol. 3(2), pages 153-174.
  4. Giles, John & Satriawan, Elan, 2010. "Protecting child nutritional status in the aftermath of a financial crisis : evidence from Indonesia," Policy Research Working Paper Series 5471, The World Bank.
  5. Ravallion, Martin, 2012. "Can we trust shoestring evaluations ?," Policy Research Working Paper Series 5983, The World Bank.
  6. Jere R. Behrman & Maria Cecilia Calderon & Olivia S. Mitchell & Javiera Vasquez & David Bravo, 2011. "First-Round Impacts of the 2008 Chilean Pension System Reform," Working Papers wp245, University of Michigan, Michigan Retirement Research Center.
  7. Harold Alderman, 2011. "No Small Matter : The Impact of Poverty, Shocks, and Human Capital Investments in Early Childhood Development," World Bank Publications, The World Bank, number 2266, February.
  8. Michael Christian Lehman, 2014. "Long-Run Effects Of Conditional Cash Transfers," Anais do XLI Encontro Nacional de Economia [Proceedings of the 41th Brazilian Economics Meeting] 223, ANPEC - Associação Nacional dos Centros de Pósgraduação em Economia [Brazilian Association of Graduate Programs in Economics].
  9. Bouguen, Adrien & Filmer, Deon & Macours, Karen & Naudeau, Sophie, 2013. "Impact evaluation of three types of early childhood development interventions in Cambodia," Policy Research Working Paper Series 6540, The World Bank.
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