Refer to the Business Week magazine data in Problem 13 of Chapter 8. The relationships among the
Question:
a. Test whether 1989 rank, P-E ratio, and 1990 rank, taken together, significantly help to predict the yield.
b. Test whether 1990 rank is associated with the yield after taking into account the contribution of 1989 rank and P-E ratio.
c. Should 1990 rank be included in the model to control for confounding? Explain your answer, including discussion of any assumptions you made in reaching your answer.
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Related Book For
Applied Regression Analysis and Other Multivariable Methods
ISBN: 978-1285051086
5th edition
Authors: David G. Kleinbaum, Lawrence L. Kupper, Azhar Nizam, Eli S. Rosenberg
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