STA 302 / 1001 -- Regression Analysis -- Fall 2003

Recommended practice problems from text book:

• Week of September 8:
  Chapter 1: 1.3, 1.5, 1.6, 1.7, 1.8, 1.11, 1.16, 1.18, 1.20*, 1.21*, 1.24*, 1.29, 1.30, 1.33, 1.36, 1.39, 1.40, 1.41a
  For questions marked *, output from SAS will be posted here. Your job is to interpret that output.
  SAS output (.lst file) for 1.20 and 1.24
  Plot for 1.20 in pdf
  SAS program for 1.20 and 1.24
  SAS output (.lst file) for 1.21
  Plot for 1.21 in pdf
  SAS program for 1.21
  Sketch of solutions in pdf
• Chapter 2: 2.1, 2.2, 2.3, 2.5, 2.6 (skip part e), 2.8 (skip part b), 2.12, 2.14, 2.18, 2.21, 2.22, 2.24, 2.35, 2.37, 2.38, 2.40, 2.42
  For Test 1 you can skip the following problems: 2.8 part c, 2.14 part d, 2.18, 2.24 part b
  Sketch of solutions in pdf
• Chapter 3: 3.1, 3.2, 3.4bcdefh (in part e skip the part about using Table B.6), 3.5bcdef, 3.9, 3.18, 3.19, 3.20
  Plot of residuals versus predictor variable for 3.4 (jpeg)
  Plot of residuals versus predicted values for 3.4 (jpeg)
  Normal probability plot of residuals for 3.4 (jpeg)
  Plot of predictor variable versus order for 3.4 (jpeg)
  Plot of residuals versus order for 3.4 (jpeg)
  Plot of residuals versus X2 for 3.4 (jpeg)
  Plot of residuals versus X3 for 3.4 (jpeg)
  SAS code for 3.9 (text)
  Plot for 3.9 (jpeg)
  SAS code for 3.5 (text)
  SAS output for 3.5 including stem and leaf plot of residuals (text)
  Plot of number of transfers versus time for 3.5 (jpeg)
  Plot of residuals versus number of transfers for 3.5 (jpeg)
  Normal probability plot of residuals for 3.5 (jpeg)
  Plot of residuals versus time for 3.5 (jpeg)
  SAS code for 3.18 (text)
  SAS output for 3.18 (text)
  Plot of y versus x for 3.18 (jpeg)
  Plot of y versus square root of x for 3.18 (jpeg)
  Plot of residuals versus fits for 3.18 (jpeg)
  Normal probability plot of residuals for 3.18 (jpeg)
  Solutions (pdf)
• Chapter 4: 4.1, 4.3, 4.4, 4.8ab, 4.19, 4.21, 4.22
  SAS output for 4.3 (text)
  SAS output for 4.4 and 4.8 (text)
  SAS output for 4.19 (text)
  Solutions (pdf)
• Chapter 5: 5.1, 5.3, 5.4, 5.8, 5.10, 5.12, 5.17, 5.21, 5.23, 5.29, 5.31
  Solutions (pdf)
• Chapter 6: 6.2, 6.3, 6.5abcd, 6.6, 6.7a, 6.8, 6.18bcde, 6.19, 6.20, 6.21, 6.22, 6.25, 6.27
  SAS for 6.5, 6.6, 6.7 and 6.8:
  SAS code (text)
  SAS output (text)
  Pairwise scatterplots (pdf)
  Plot of residuals versus predicted values (pdf)
  Plot of residuals versus X1 (pdf)
  Plot of residuals versus X2 (pdf)
  Normal probability plot of residuals (pdf)
  Plot of residuals versus interaction term (pdf)
  SAS for 6.18, 6.19, 6.20 and 6.21:
  SAS code (text)
  SAS output (text)
  Pairwise scatterplots (pdf)
  Plot of residuals versus predicted values (pdf)
  Plot of residuals versus X1 (pdf)
  Plot of residuals versus X2 (pdf)
  Plot of residuals versus X3 (pdf)
  Normal probability plot of residuals (pdf)
  Plot of residuals versus interaction term X1X2 (pdf)
  Plot of residuals versus interaction term X1X3 (pdf)
  Plot of residuals versus interaction term X2X3 (pdf)
  Solutions (pdf)
  (In 6.8 the critical value is 3.012, NOT 2.012.)
  Another typo in the solutions: there is a missing equal sign (before the beta0) in the solution to 6.25.
• Chapter 7: 7.2, 7.3, 7.7, 7.8, 7.12, 7.15, 7.20, 7.22, 7.23, 7.27, 7.30, 7.33, 7.40, 7.46, 7.55
  SAS output for 7.3, 7.12, and 7.40 (text) (changed December 10 to add more output needed for 7.12)
  SAS output for 7.7, 7.8, 7.15, and 7.27(text)
  SAS output for 7.33 (text) (changed December 10 to add more output needed)
  Plot of residuals versus predicted values for 7.33 (pdf)
  Plot of data (Y vs. X) plus fitted cubic curve ("p" is for predicted values) for 7.33 (pdf)
  Solutions (pdf)
• Chapter 11: 11.1, 11.3, 11.4, 11.6, 11.8, 11.10, 11.13, 11.14abcdg
  SAS output for 11.4 and 11.8 (text)
  Plot of residuals versus interaction term for 11.4 (pdf)
  SAS output for 11.14 (text) (changed December 11 to add sequential sums of squares)
  Scatterplot for 11.14 (pdf)
  Plot of residuals vs predicted values for corner lots for 11.14 (pdf)
  Plot of residuals vs predicted values for non-corner lots for 11.14 (pdf)
  Plot of residuals vs X1 for 11.14 (pdf)
  Plot of residuals vs X2 for 11.14 (pdf)
  Plot of residuals vs X1*X2 for 11.14 (pdf)
  Normal probability plot of residuals for 11.14 (pdf)
  Solutions (pdf)

E-mail course instructor: alison.gibbs@utstat.utoronto.ca