Correlation coefficient

[mattc]

What is correlation coefficient? What can you say when the correlation coefficient is zero, and why is it zero?

[omega]

The correlation coefficient measures the strength of a linear relationship between two sets of numbers. A positive coefficient indicates the values of variable A vary in the same direction as variable B. A negative coefficient indicates the values of variable A and variable B vary in opposite directions.

A correlation coefficient of zero means that there is no relationship between the variables. Variable A does not change when variable B changes.