3/31/2009

Tying up loose ends

• Chapter 6 homework
• Interpreting
• Model assumptions
• “Discuss”
• F test for lack of fit

• Chapter 7 homework

Chapter 8: Quantitative and Qualitative Predictors

• Types of Interaction Effects – See Figure 8.8 and #8.10
• Responses Surfaces & Contour plots
• In Maple
• In SAS

• Another Example of fitting a Polynomial Regression Model: Powercell_Ch8.sas

• Qualitative Predictors
• Setup
• Interpretation of regression coefficients
• Interaction between qualitative and quantitative predictors
• Interpretation of regression coefficients
• Types of interaction

1. ordinal

2. disordinal

For Thursday: Read the rest of Chapter 8, prepare #8.6 and 8.7 for a Problem Session on Thursday.