one variable decreases as the other increases Fig. A value close to -1 indicates a strong negative linear relationship (i.e. one variable increases with the other Fig. A value of the correlation coefficient close to +1 indicates a strong positive linear relationship (i.e. The value of r always lies between -1 and +1. This is the product moment correlation coefficient (or Pearson correlation coefficient). Where is the mean of the x values, and is the mean of the y values. ), then the correlation coefficient is given by the following equation: In algebraic notation, if we have two variables x and y, and the data take the form of n pairs (i.e. To quantify the strength of the relationship, we can calculate the correlation coefficient. On a scatter diagram, the closer the points lie to a straight line, the stronger the linear relationship between two variables.
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