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Partner Selection into Policy Relevant Field Experiments

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  • Belot, Michele
  • James, Jonathan

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 eff ects. The experimental work consists in testing the e ffects 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 nd 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 signifi cant di erences in the treatment e ffects of the experiment between variables which, albeit to a mild degree, are correlated with selection into the experiment. To our knowledge, this is the rst study providing direct evidence on the magnitude of self-selection in fi eld experiments.

Suggested Citation

  • Belot, Michele & James, Jonathan, 2013. "Partner Selection into Policy Relevant Field Experiments," SIRE Discussion Papers 2013-112, Scottish Institute for Research in Economics (SIRE).
  • Handle: RePEc:edn:sirdps:537
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    Cited by:

    1. Belot, Michèle & James, Jonathan & Nolen, Patrick, 2016. "Incentives and children's dietary choices: A field experiment in primary schools," Journal of Health Economics, Elsevier, vol. 50(C), pages 213-229.
    2. Belot, Michèle & James, Jonathan, 2014. "A new perspective on the issue of selection bias in randomized controlled field experiments," Economics Letters, Elsevier, vol. 124(3), pages 326-328.
    3. repec:esx:essedp:753 is not listed on IDEAS
    4. Michael Sanders & Aisling Ní Chonaire, 2015. "“Powered to Detect Small Effect Sizes”: You keep saying that. I do not think it means what you think it means," The Centre for Market and Public Organisation 15/337, The Centre for Market and Public Organisation, University of Bristol, UK.

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    More about this item

    Keywords

    Selection; Field Experiments; Randomised controlled trials; External Validity;
    All these keywords.

    JEL classification:

    • C93 - Mathematical and Quantitative Methods - - Design of Experiments - - - Field Experiments
    • I18 - Health, Education, and Welfare - - Health - - - Government Policy; Regulation; Public Health
    • J13 - Labor and Demographic Economics - - Demographic Economics - - - Fertility; Family Planning; Child Care; Children; Youth

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