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Same difference? Understanding variation in the estimation of effect sizes from educational trials

Xiao, ZhiMin and Kasim, Adetayo and Higgins, Steve (2016) 'Same difference? Understanding variation in the estimation of effect sizes from educational trials.' International Journal of Educational Research, 77. pp. 1-14. ISSN 0883-0355

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Abstract

By applying four analytic models with comparable outcomes and covariates to a dataset of 20 outcomes from 17 educational trials, we found results closely matching in well-powered studies without serious implementation problems. The interventions and evaluations were all funded by the Education Endowment Foundation and independently evaluated. We demonstrated that when an analysis takes little account of research design, or where there were difficulties with implementation and data collection, point estimates of effect differ and estimates of precision vary. This adds to the challenge of understanding the comparative impact of interventions and deciding which are worth scaling up.

Item Type: Article
Uncontrolled Keywords: Evaluation; Effect size; RCT; Multilevel modelling; Bayesian MLM
Divisions: Faculty of Science and Health
Faculty of Science and Health > Health and Social Care, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 20 Sep 2021 08:36
Last Modified: 18 Aug 2022 12:22
URI: http://repository.essex.ac.uk/id/eprint/30843

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