## correlationThe extent to which two or more variables change together. Pairs of observations can be plotted as a series of points on a graph. The correlation
coefficient measures the extent to which the points on the resulting
scatter diagram form a straight line. The correlation coefficient
varies within the range +1 (where an increase in one variable is associated
with a corresponding increase in the other) to -1 (where an increase of
one variable is associated with a corresponding decrease of the other);
a coefficient of 0 indicates no linear relationship between the two variables.
Multivariate analysis can be used to investigate the correlation
in several variables. ## Related category• PROBABILITY AND STATISTICS | |||||

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