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Sample Attrition Bias in Randomized Experiments : A Table of Two Surveys

  • Luc BEHAGHEL

    (Crest)

  • Bruno CREPON

    (Crest)

  • Marc GURGAND

    (Crest)

  • Thomas LE BARBANCHON

    (Crest)

The randomized trial literature has helped to renew the field of microeconometric policy evaluation byemphasizing identification issues raised by endogenous program participation. Measurement andattrition issues have perhaps received less attention. This paper analyzes the dramatic impact of sampleattrition in a large job search experiment. We take advantage of two independent surveys on the sameinitial sample of 8,000 persons. The first one is a long telephone survey that had a strikingly low andunbalanced response rate of about 50%. The second one is a combination of administrative data and ashort telephone survey targeted at those leaving the unemployment registers; this enriched data sourcehas a balanced and much higher response rate (about 80%). With naive estimates that neglect nonresponses, these two sources yield puzzlingly different results.Using the enriched administrative data as benchmark, we find evidence that estimates from the longtelephone survey lack external and internal validity. We turn to existing methods to bound the effectsin the presence of sample selection; we extend them to the context of randomization with imperfectcompliance. The bounds obtained from the two surveys are compatible but those from the longtelephone survey are somewhat uninformative. We conclude on the consequences for data collectionstrategies.

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Paper provided by Centre de Recherche en Economie et Statistique in its series Working Papers with number 2009-05.

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Length: 30
Date of creation: 2009
Date of revision:
Handle: RePEc:crs:wpaper:2009-05
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  1. Duflo, Esther & Glennerster, Rachel & Kremer, Michael, 2008. "Using Randomization in Development Economics Research: A Toolkit," Handbook of Development Economics, Elsevier.
  2. Card, David & Chetty, Raj & Weber, Andrea, 2007. "The Spike at Benefit Exhaustion: Leaving the Unemployment System or Starting a New Job?," IZA Discussion Papers 2590, Institute for the Study of Labor (IZA).
  3. Ashenfelter, Orley & Ashmore, David & Deschenes, Olivier, 2000. "Do Unemployment Insurance Recipients Actively Seek Work? Evidence From Randomized Trials in Four U.S. States," IZA Discussion Papers 128, Institute for the Study of Labor (IZA).
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