2/11/2011

See Chapter3-Twolines.ppt

• Discussion of Exercise 3.22
• Comparing two regression lines
  • Fitting separate regression lines (for different levels of a group variable)
  • Indicator variables
  • Comparing intercepts
  • Comparing slopes
  • Nested F-test

R LAB

• See Kids198.R script for a variety of new commands
  
• Installing packages in R (We need ggplot2 and HH for today.)
• Load the packages using the library command or interactively.
• Exercise 3.9 on p. 139

Please read Section 3.4 for class on Monday. We will have a problem session on Monday, where some of you will present your solution to Exercise 2.13.