What should we do about meta-analysis and effect size? – CEM Blog

In part 1 of this series of blog posts, I set out some of the recent criticisms that have been made by researchers such as Wiliam, Simpson and Slavin about the use of effect sizes to compare the impact of different interventions and the resulting problems in combining them in meta-analysis.

If effect sizes are so confounded with methodological aspects of the studies from which they arise – and in ways that are seldom, and perhaps can never be, unpicked from those studies – should we trust them as indicators of the effect that an intervention is likely to have in our school or classroom?

If we discount all the ‘evidence’ from meta- and meta-meta-analysis, what are we left with? Is this a crisis for evidence-based (or even evidence-informed) practice?

Source: What should we do about meta-analysis and effect size? – CEM Blog

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