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Timing and Duration of Exposure in Evaluations of Social Programs

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Author Info
Elizabeth M. King
Jere R. Behrman

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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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File URL: http://hdl.handle.net/10.1093/wbro/lkn009
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Publisher Info
Article provided by Oxford University Press 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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