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Ainsworth, Hannah; Hewitt, Catherine E.; Higgins, Steve; Wiggins, Andy; Torgerson, David J.; Torgerson, Carole J. – Educational Research and Evaluation, 2015
Randomised controlled trials (RCTs) can be at risk of bias. Using data from a RCT, we considered the impact of post-randomisation bias. We compared the trial primary outcome, which was administered blindly, with the secondary outcome, which was not administered blindly. From 44 schools, 522 children were randomised to receive a one-to-one maths…
Descriptors: Statistical Bias, Research Methodology, Science Experiments, Research Design
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Lenkeit, Jenny; Caro, Daniel H. – Educational Research and Evaluation, 2014
Reports of international large-scale assessments tend to evaluate and compare education system performance based on absolute scores. And policymakers refer to high-performing and economically prosperous education systems to enhance their own systemic features. But socioeconomic differences between systems compromise the plausibility of those…
Descriptors: Educational Assessment, Educational Research, Socioeconomic Influences, Educational Policy