FILE SELECTED // FILE 00
Effect Size
“Detecting a difference and knowing how much it matters are separate questions.”
01 / SUMMARY
In short
An effect size quantifies the magnitude of a difference, association, or other contrast on a defined scale. Practical relevance depends on domain, uncertainty, and the cost of acting.
03 / SCENE
In the wild
An app cuts average task time by 0.2 seconds; across millions of uses that may matter, while elsewhere it may be trivial.
04 / LIMIT
The limit
Small, medium, and large are conventional reference labels, not universal laws of importance.
FINAL NOTE
What remains
Report magnitude and interval, then judge meaning in the real context.