Controlled and natural experiments 

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Microsoft Word - memo122.doc
... interventions are effective and which not. a review of the evaluation literature based on such controlled or natural experiments shows that both timing (when to intervene?) and type (how to ... of various education policy instruments. we focus on evaluation studies based on controlled and natural experiments. section 4 concludes and presents some suggestions for further research. 8 2 rationale for ...
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Microsoft Word - cpbdoc48_eng.doc
... experiments 11 3 controlled policy experiments controlled experiment 13 3.2 advantages of controlled policy experiments 14 3.3 disadvantages of controlled policy experiments 14 3.4 us experiences with controlled policy experiments 16 4 natural policy experiments 19 5 comparison of controlled and natural experiments and ...
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DS3243_Jaarverslag
... and the united states and it sells its products worldwide. whole foods market (united states) whole foods market is a supermarket chain that specialises in natural and organic food, household products and ... controlled cir- cumstances that limit the risks for people and the environment as far as possible and provided that a significant contribution is made to sustainable development and ... experiments ...
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