Chapter 4 Two-Variables Analysis 09/19-20/2013. Outline  Issue: How to identify the linear relationship between two variables?  Relationship: Scatter.

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Chapter 4 Two-Variables Analysis 09/19-20/2013

Outline  Issue: How to identify the linear relationship between two variables?  Relationship: Scatter Plot is a collection of observations on an X-Y graph Covariance conveys the direction of the potential relationship Correlation coefficient measures the strength of a linear relationship between two variables  Causality and predictions: Least squares line

Scatter Plot

Scatter Plot: Degree of Association

Covariance  A measure of the strength of a linear relationship between two variables  While the magnitude changes with the units, its sign conveys direction only.  Positive covariance  Positive linear relationship  Negative covariance  Negative linear relationship Population CovarianceSample CovarianceRelation

Correlation coefficient  Unit-free and always between -1 (perfectly negative linear relationship) and +1 (perfectly positive linear relationship)  The greater the absolute value of the correlation coefficient, the stronger the linear relationship. Population Correlation Sample Correlation

Least squares line  A Unique line that describes the relationship between two variables, when one causes the other. It has the smallest sum of squared error!

Sum of Squared Error is the observed value andis the predicted value.