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Partner Selection into Policy Relevant Field Experiments

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    Abstract

    This study investigates the issue of self-selection of stakeholders into participation and collaboration in policy-relevant experiments. We document and test the implications of self-selection in the context of randomised policy experiment we conducted in primary schools in the UK. The main questions we ask are (1) is there evidence of selection on key observable characteristics likely to matter for the outcome of interest and (2) does selection matter for the estimates of treatment effects. The experimental work consists in testing the effects of an intervention aimed at encouraging children to make more healthy choices at lunch. We recruited schools through local authorities and randomised schools across two incentive treatments and a control group. We document the selection taking place both at the level of local authorities and at the school level. Overall we find mild evidence of selection on key observables such as obesity levels and socio-economic characteristics. We find evidence of selection along indicators of involvement in healthy lifestyle programmes at the school level, but the magnitude is small. Moreover, we do not find significant differences in the treatment effects of the experiment between variables which, albeit to a mild degree, are correlated with selection into the experiment. To our knowledge, this is the first study providing direct evidence on the magnitude of self-selection in field experiments.

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    Paper provided by Edinburgh School of Economics, University of Edinburgh in its series ESE Discussion Papers with number 236.

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    Length: 32
    Date of creation: 19 Dec 2013
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    Handle: RePEc:edn:esedps:236

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    1. Armin Falk, 2007. "Gift Exchange in the Field," Econometrica, Econometric Society, vol. 75(5), pages 1501-1511, 09.
    2. Bandiera, Oriana & Barankay, Iwan & Rasul, Imran, 2006. "Incentives for Managers and Inequality Among Workers: Evidence from a Firm Level Experiment," IZA Discussion Papers 2062, Institute for the Study of Labor (IZA).
    3. Ernst Fehr & Lorenz Goette, 2007. "Do Workers Work More if Wages Are High? Evidence from a Randomized Field Experiment," American Economic Review, American Economic Association, vol. 97(1), pages 298-317, March.
    4. Jens Ludwig & Jeffrey R. Kling & Sendhil Mullainathan, 2011. "Mechanism Experiments and Policy Evaluations," NBER Working Papers 17062, National Bureau of Economic Research, Inc.
    5. David Card & Stefano DellaVigna & Ulrike Malmendier, 2011. "The Role of Theory in Field Experiments," NBER Working Papers 17047, National Bureau of Economic Research, Inc.
    6. Heckman, James J. & Lalonde, Robert J. & Smith, Jeffrey A., 1999. "The economics and econometrics of active labor market programs," Handbook of Labor Economics, in: O. Ashenfelter & D. Card (ed.), Handbook of Labor Economics, edition 1, volume 3, chapter 31, pages 1865-2097 Elsevier.
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