What is an effect size?

A measure within education research, known as effect size, allows teachers to compare the impact of different interventions

What is an effect size?

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What is an effect size?

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Effect size is a quantitative measure of the difference between two groups.Ģż

In systematic reviews and meta-analyses, effect sizes are calculated based on the ā€œstandardised mean differenceā€ between two groups in a trial - this is the difference between the average score of participants in the intervention group and the average score of participants in the control group.ĢżĢż

Where can I see effect sizes in action?Ģż

Research conducted by the EEF found that in the early years can add up to six months of progress. The approaches need to explicitly support communication through talking, verbal expression, modelling language and reasoning.

In the Teaching and Learning Toolkit, the EEF also identifies as having the potential to add up to seven months of progress. Self-regulated learning can be broken down into three essential components:Ģż

  • Cognition - the mental process involved in knowing, understanding and learning.
  • Metacognition - often defined as ā€œlearning to learnā€.
  • Motivation - willingness to engage our metacognitive and cognitive skills.Ģż

Further reading:Ģż

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