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Facts about correlation

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Facts about correlation The formula for  correlation  helps us see that  r  is positive when there is a  positive   association  between the  variables . Height and weight, for example, have a  positive   association . People who are above average in height tend to also be above average in  weight. Both the standardized height and the standardized weight are positive. People  who are below average in height tend to also have below-average weight. Then both  standardized height and standardized weight are negative. In both cases, the products in  the formula for  r  are mostly positive and so  r  is positive. In the same way, we can see  that  r  is negative when the association between  x  and  y  is negative. More detailed study  of the formula gives more detailed properties of  r . Here is what you need to know in order  to interpret  correlation .
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