
Correlation coefficient definitionPearson's correlation coefficient (r), expresses the degree of linear relationship between two variables measured from the same individual. Pearson's r values can range between 1.00 to +1.00. A correlation coefficient of +1.00 signifies a perfect positive relationship, while 1.00 shows a perfect negative relationship. The smallest correlation is zero. 

Correlation coefficient formulaOne formula for Pearson's r equation is: r = Sum(ZxZy) / N which indicates that Pearson's r is equal to the average crossproduct of the variables in standardized form. 


Correlation significancePearson's r can be assessed for significance using a standard F test. 

