PEARSON’S PRODUCT MOMENT COEFFICIENT OF CORRELATION r (PPMCC)

This provides a measure of the strength of association between two variables; one the dependent variable, the other the independent variable, r, can range from +1 i.e. perfect positive correlation where the variables change value in the same direction as each other, to -1 i.e. perfect negative correlation where y decreases linearly as x increases. There are several possible formulae but practical ones are:

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