The article “Models for Assessing Hoisting Times of Tower
Chapter 8, Problem 18E(choose chapter or problem)
The article “Models for Assessing Hoisting Times of Tower Cranes” (A. Leung and C. Tam, Journal of Construction Engineering and Management, 1999: 385–391) presents a model constructed by a stepwise regression procedure to predict the time needed for a tower crane hoisting operation. Twenty variables were considered, and the stepwise procedure chose a nine-variable model. The adjusted \(R^2\) for the selected model was 0.73. True or false:
a. The value 0.73 is a reliable measure of the goodness of fit of the selected model.
b. The value 0.73 may exaggerate the goodness of fit of the model.
c. A stepwise regression procedure selects only variables that are of some use in predicting the value of the dependent variable.
d. It is possible for a variable that is of no use in predicting the value of a dependent variable to be part of a model selected by a stepwise regression procedure.
Equation Transcription:
Text Transcription:
R^2
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