3/19/2009

Chapter 7: Multiple Regression II, cont’d.

• Coefficients of Partial Determination
• Calculation
• Interpretation
• Coefficients of partial correlation
• Standardized Regression Model
• Why standardize?
• How to standardize?
• Example: Bodyfat.sas

Problem Session: #7.7, 7.10, 7.15, 7.22

• Multicollinearity
• When X’s are completely uncorrelated
• When X’s are perfectly correlated
• When X’s are somewhat correlated
• Effect on Extra SS
• Effect on b_k’s
• Effect on predictions
• Effect on t-tests

For Tuesday: Chapter 7 homework is due; we will be presenting most of those problems in a Problem Session.