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Unformatted text preview: all predictor variables should be retained? 3. Find the four best subsets according to the to the R 2 a . 4. Since there is relatively little dierence in R 2 a for the four best subsets what other criterion would you use to help in the selection? 5. Using forward stepwise regression, nd the best subset of predictor variables to predict Y. Use .05 to enter and .10 to delete. In the model statement use selection=stepwise slentry=.05 slstay=.10. 6. How does the best subset according to forward stepwise regression compare with the best subset according to #3? Using all the information, what nal model would you suggest? 7. Using the nal model suggested above. Obtain the residuals and plot them against Y and each of the predictor variables. Comment on assumptions. 8. Prepare a Normal Probability Plot and Test for normality. 9. Obtain the partial regression plots and comment. 10. Assess the presence of outliers and inuential observations. Comment. 1...
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This note was uploaded on 09/25/2011 for the course STP 452 taught by Professor Yen during the Fall '10 term at ASU.
- Fall '10