Reconsider the mine fracture data from Problems 13.7 and 13.8. Construct plots of the deviance residuals from
Question:
Reconsider the mine fracture data from Problems 13.7 and 13.8. Construct plots of the deviance residuals from the best model you found and comment on the plots. Does the model appear satisfactory from a residual analysis viewpoint?
Problems 13.7
Myers [1990] presents data on the number of fractures (y) that occur in the upper seams of coal mines in the Appalachian region of western Virginia. Four regressors were reported: x1= inner burden thickness (feet), the shortest distance between seam floor and the lower seam; x2= percent extraction of the lower previously mined seam; x3= lower seam height (feet); and x4= time (years) that the mine has been in operation. The data are shown below.
Problems 13.8
Reconsider the mine fracture data from Problem 13.7. Remove any regressors from the original model that you think might be unimportant and rework parts b-e of Problem 13.7. Comment on your findings.
Data From Problem 13.7
Myers [1990] presents data on the number of fractures (y) that occur in the upper seams of coal mines in the Appalachian region of western Virginia. Four regressors were reported: x1=x1= inner burden thickness (feet), the shortest distance between seam floor and the lower seam; x2=x2= percent extraction of the lower previously mined seam; x3=x3= lower seam height (feet); and x4=x4= time (years) that the mine has been in operation. The data are shown below.
Step by Step Answer:
Introduction To Linear Regression Analysis
ISBN: 9781119578727
6th Edition
Authors: Douglas C. Montgomery, Elizabeth A. Peck, G. Geoffrey Vining