**Correlation Coefficient**

A number that is a measure of the strength and direction of the correlation between two variables. Correlation coefficients are expressed using the variable *r*, where *r* is between 1 and –1, inclusive. The closer *r* is to 1 or –1, the less scattered the points are and the stronger the relationship. Only data points with a scatterplot which is a perfectly straight line can have *r* = –1 or *r* = 1. When *r* < 0 the data have a negative association, and when *r* > 0 the data have a positive association.

**See also**

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