
Chapter 15
PB
Multiple Regression Analysis
603
Figure 15.60 is the regression output produced using Minitab for the data given in Table15.12.
From the output (Figure 15.60), it can be seen that number of showrooms which is a collinear var-
iable is identi ed and is automatically dropped from the model. The nal output contains only one
independent variable that is advertisment.
TABLE 15.12
Sales as the dependent variable and advertisement and number of showrooms as the
independent variables
Sales (in thousand rupees) Advertisement (in thousand rupees) Number of showrooms
10 5 3
13 3 1
15 4 2
16 7 5
17 9 7
18 6 4
20 8 6
22 10 8
26 12 10
29 11 9
30 10 8
35 9