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Unformatted text preview: • Leverage Values • DFFITS • DFBETAS Which Counties are “problem counties” with respect to each measure? Why? e) Plot the studentized residuals ( *SRESID on Y-axis) vs standardized predicted values ( *ZPRED on X-axis). Is there evidence of the residual variance being related to the mean of the response? Why? f) Obtain a histogram of the standardized residuals. Do they appear to be approximately normally distributed. g) Fit the regression model with all k =6 predictors. Obtain the Variance Inflation Factors. Is multicollinearity a problem? Give the regression coefficients and standard errors for all terms. Compare these with the model from c), including Variance Inflation Factors. Put N/A under reduced model for variables not included in model. Full Model ( k =6 predictors) Reduced Model (from part c) Predictor Coeff Std. Error VIF Coeff Std. Error VIF X 1 X 2 X 3 X 4 X 5 X 6...
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This note was uploaded on 01/20/2012 for the course STA 6127 taught by Professor Mukherjee during the Spring '08 term at University of Florida.
- Spring '08