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   / Home / LernStats / Correlation / Product-Moment Coefficient of Correlation


LernStats
(Chapter 5 - Page 5 / 9)

Product-Moment Coefficient of Correlation

The Product-Moment Coefficient of Correlation is also known as Bravais-Pearson coefficient of correlation.

It describes linear correlation between two interval - scaled variables by means of the coefficient r similar to the covariance ­ with the difference that both variables are related to the product of their standard deviation and thus not receptive for differences in scale and variance between the variables

Most specific measures of correlation are based on this coefficient.

This is the formula for the correlation:

r always lies between 1 and -1 .

Where is:
-1
there is absolute opposition between the two variables;
0
there is no linear correlation: the variables are independent;
+1
there is a perfect correlation between the two variables.



 
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