Glossary // Glossary term Technical
Evidence level
The site's classification of a source by study design, from A to E. A: meta-analyses and systematic reviews of controlled studies; B: controlled experiments; C: longitudinal or quasi-experimental studies; D: cross-sectional and qualitative studies, narrative reviews and theory; E: classical texts, expert opinion, project records and artistic material. The level describes design, not truth, and is read together with the confidence rating of each claim. 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