noun phrase · academic
effect size
/ˈefɛkt saɪz/EF·fect SIZE
a quantitative measure of the magnitude of a phenomenon or difference, not just its statistical significance
Examples
“The paper reported a moderate effect size, suggesting the intervention had a meaningful impact.”
“Effect size helps readers understand practical importance beyond p-values.”
“Cohen's d and Pearson's r are common measures of effect size.”
Band 8 sentence
“Rather than focusing solely on p-values, high-quality papers always report effect sizes so readers can judge practical importance.”
Collocations
- report the effect size
- a large/moderate/small effect size
- calculate effect size
Word family
Common mistakes
effect's size→effect size
size of effect→effect size
Say it for a higher band
5size of effect→6magnitude of effect→7+effect size
Synonyms
magnitude of effect
Easily confused
statistical significance
“Although the result was statistically significant, the effect size was very small.”
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