Glossary // Glossary term Technical
Correlation coefficient
A number between −1 and +1 that describes the strength and direction of a linear association between two variables, most often Pearson's r. A correlation says nothing by itself about which variable influences the other, or whether a third variable drives both. It can be attenuated by unreliable measurement or a restricted range, and a correlation computed across people need not hold within any one person over time. 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. 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. The works the definition rests on, with the level of evidence each was appraised at. (2018). Thinking clearly about correlations and causation: Graphical causal models for observational data. doi:10.1177/2515245917745629 Supports statements that correlation does not establish causation, that statistical control depends on assumptions, and that controlling for colliders or mediators can bias estimates. Methods guidance.Where the site uses it
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