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Correlation Coefficient
R
A
measure of how much linear relationship exists between the values for the
two variables.
- The correlation coefficient
can range between +1 and -1.
- Positive values indicate
a relationship between X and Y variables so that as X increases so does
Y.
- Negative values mean
the relationship between X and Y is such that as values for X increase,
values for Y decrease.
- A value near zero
means that there is a random, nonlinear relationship between the two
variables.
where  y
is the sample sigma of the y values.
Sxy and Sxx calculations are shown in Regression
Function .
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