11/10/2011

Regression Model Diagnostics (see AVP and Unusual Points.ppt)

• Added variable plots - see handout
• Identifying outliers
  • Standardized residuals
  • Studentized residuals
  • Deleted residuals
  • Studentized deleted residuals
  • Hat matrix leverage values
• Influential observations
  • DFFITS
  • DFBETAS
  • Cook's Distance
• Multicollinearity Diagnostics
  • Variance Inflation Factors (VIF)

Model diagnostics in R - see Bodyfat-Ch10.R

We will have a problem session on Tuesday.

Our second exam will be in class next Thursday. See \\Microwave\Courses\Math305 for sample exams.