Correlation-coefficient meaning

A measure of the interdependence of two random variables that ranges in value from −1 to +1, indicating perfect negative correlation at −1, absence of correlation at zero, and perfect positive correlation at +1.
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Any of several measures of concomitant variation in two or more variables.
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A statistical measurement that shows to what extent two variables move together.
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(statistics) Any of the several measures indicating the strength and direction of a linear relationship between two random variables.
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