All Outputs (2)

Unmasking the unasked: correcting the record about assessor masking as an explanation for effect size differences (2018)
Journal Article
Simpson, A. (2018). Unmasking the unasked: correcting the record about assessor masking as an explanation for effect size differences. Educational Research and Evaluation, 24(1-2), 3-12. https://doi.org/10.1080/13803611.2018.1520131

Ainsworth et al.’s paper “Sources of Bias in Outcome Assessment in Randomised Controlled Trials: A Case Study” examines alternative accounts for a large difference in effect size between 2 outcomes in the same intervention evaluation. It argues that... Read More about Unmasking the unasked: correcting the record about assessor masking as an explanation for effect size differences.

Princesses are bigger than Elephants: effect size as a category error in evidence based education (2018)
Journal Article
Simpson, A. (2018). Princesses are bigger than Elephants: effect size as a category error in evidence based education. British Educational Research Journal, 44(5), 897-913. https://doi.org/10.1002/berj.3474

Much of the evidential basis for recent policy decisions is grounded in effect size: the standardised mean difference in outcome scores between a study's intervention and comparison groups. This is interpreted as measuring educational influence, impo... Read More about Princesses are bigger than Elephants: effect size as a category error in evidence based education.