Partner Selection into Policy Relevant Field Experiments

Michèle Belot and Jonathan James

No 2013-112, SIRE Discussion Papers from Scottish Institute for Research in Economics (SIRE)

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.

Keywords: Selection; Field Experiments; Randomised controlled trials; External Validity (search for similar items in EconPapers)
Date: 2013
New Economics Papers: this item is included in nep-exp, nep-ger and nep-ure
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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Related works:
Journal Article: Partner selection into policy relevant field experiments (2016)
Working Paper: Partner Selection into Policy Relevant Field Experiments (2013)
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Persistent link: https://EconPapers.repec.org/RePEc:edn:sirdps:537

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