Coefficient of Correlation


See Pearson's Correlation Coefficient
Correlation is the strength of the relationship between two variables.
Pearson's Correlation Coefficient (R) 

Pearson's Product Moment is the most commonly used coefficient of correlation. It is a coefficient used to specify the strength of the relationship between two variables. It has a value between 1 and +1.
A coefficient of +1 means perfect correlation. A coefficient of 1 means perfect negative correlation (when one variable increases the other decreases). A coefficient close to zero means the variables are not related.
Examples of values of R are:
The measure R^{2} is also often used.
