Glossary // Glossary term Technical
Effect size
A quantitative estimate of how large a difference or association is, expressed in a standardised form such as a standardised mean difference or a correlation coefficient. Unlike a p-value, which mainly reflects whether a result is distinguishable from zero given the sample size, an effect size indicates magnitude and can be compared and pooled across studies. Conventional labels such as small, medium and large are rough guides, and practical importance depends on the outcome and context. Every public claim on this site with its type, evidence level, confidence, sources and review date, and an appraisal of each reference. How claims are graded, how art is kept apart from evidence, and how to report a problem. How one could reason about recording a catharsis-like change of state: signals, features, inference and context, baselines, self-report, error costs and ethics, and why every step stays uncertain. Nothing on this site measures anyone.Where the site uses it