Timing and Duration of Exposure in Evaluations of Social Programs

Posted: 6 May 2009

See all articles by Elizabeth King

Elizabeth King

World Bank - Development Research Group (DECRG)

Jere Behrman

University of Pennsylvania - Department of Economics

Multiple version iconThere are 2 versions of this paper

Date Written: February 2009

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.

Suggested Citation

King, Elizabeth and Behrman, Jere R., Timing and Duration of Exposure in Evaluations of Social Programs (February 2009). The World Bank Research Observer, Vol. 24, Issue 1, pp. 55-82, 2009. Available at SSRN: https://ssrn.com/abstract=1397483 or http://dx.doi.org/lkn009

Elizabeth King (Contact Author)

World Bank - Development Research Group (DECRG) ( email )

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Jere R. Behrman

University of Pennsylvania - Department of Economics ( email )

Ronald O. Perelman Center for Political Science
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United States
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