Repeat problem 9.3, creating two dummy variables for DEGREE using DEGREE = 1 (BA) as your reference level. Also, use the base-e log of AREA instead of AREA in your model (the SAS function LOG computes...

Repeat problem 9.3, creating two dummy variables for DEGREE using DEGREE = 1 (BA) as your reference level. Also, use the base-e log of AREA instead of AREA in your model (the SAS function LOG computes the base-e log of its argument).

Problem 9.3

We would prefer to estimate the number of books in a college library without counting them. Data are collected From colleges across the country of the number of volumes, the student enrollment (in thousands), the highest degree offered (1 = BA.2 = MA,3 = PhD), and size of the main campus (in acres). Results of this (hypothetical) study are displayed here:

Using a forward stepwise regression, show how each of the three factors affects the number of volumes in a college library. Treat DEGREE as a continuous variable (yup, that is a bit silly, but we'll do it the right way in the next problem).