Definitions for: Correlation

[n] a statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other
[n] a statistic representing how closely two variables co-vary; it can vary from -1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation); "what is the correlation between those two variables?"
[n] a reciprocal relation between two or more things

Webster (1913) Definition: Cor`re*la"tion (-l?"sh?n), n. [LL. correlatio; L.
cor- + relatio: cf. F. corr['e]lation. Cf. Correlation.]
Reciprocal relation; corresponding similarity or parallelism
of relation or law; capacity of being converted into, or of
giving place to, one another, under certain conditions; as,
the correlation of forces, or of zymotic diseases.

Correlation of energy, the relation to one another of
different forms of energy; -- usually having some
reference to the principle of conservation of energy. See
Conservation of energy, under Conservation.

Correlation of forces, the relation between the forces
which matter, endowed with various forms of energy, may
exert.

Synonyms: coefficient of correlation, correlation coefficient, correlational statistics, correlativity

See Also: biserial correlation, biserial correlation coefficient, chance-half correlation, correlational analysis, curvilinear correlation, direct correlation, indirect correlation, multiple correlation coefficient, negative correlation, nonlinear correlation, parametric statistic, partial correlation, Pearson product-moment correlation coefficient, positive correlation, product-moment correlation coefficient, reciprocality, reciprocity, skew correlation, split-half correlation, spurious correlation, statistics, tetrachoric correlation, tetrachoric correlation coefficient

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