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Correlation - Correlation Dr Myril Hillman 1 Measures the...

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04/26/11 1 Correlation Dr. Myril Hillman
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04/26/11 2 Measures the strength of a relationship But, correlation does not mean causation
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04/26/11 3 Pearson’s Product Moment Correlation Most popular correlation Requires at least interval data Requires pairs of values Relationship between two variables, X and Y, must be linear Measures covariation or association between two variables
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04/26/11 4 Values of Pearson r Range from + 1.0 to - 1.0
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04/26/11 5 Meaning of r Values Higher values indicate a “strong relationship” Lower values indicate a “ weak relationship” 0 indicates “no relationship”
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04/26/11 6 High vs. Low r Values High values show most points close to the line Low values show most points scattered away from the line
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04/26/11 7 Positive vs. Negative r Values High positive values of r: high scores in one variable match with high scores in another variable. Example: + .92 Low positive values of r: large positive scores on Y are paired with low positive scores on X. Thus, a smaller r.
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