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Lecture 5 - Correlation

# Lecture 5 - Correlation - Correlations Correlations Lecture...

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Unformatted text preview: Correlations Correlations Lecture Five Lecture Five Spring 2008 Spring 2008 Correlation (r) Correlation (r) • Mathematical technique to determine the relationship between two sets of scores. Pearson Product-moment Pearson Product-moment Correlation (r) Correlation (r) • Estimates the linear relationship between variables. The Mathematical Technique The Mathematical Technique Karl Pearson Karl Pearson • The degree of relationship The degree of relationship Magnitude (strength) of r Magnitude (strength) of r • How close r is to +1.00 or -1.00. • Higher absolute value of r, the stronger the correlation. • r = +1.00 -- perfect positive correlation. • r = -1.00 -- perfect negative correlation. Factors that influence magnitude of r: Factors that influence magnitude of r: • Linearity If the relationship between two variables is curvilinear, Pearson r will underestimate the true relationship....
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Lecture 5 - Correlation - Correlations Correlations Lecture...

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