Question: Analyze the steel data, Appendix D, Table D.5 for unusual observations. Determine the case diagnostics, added-variable and principal component plots, and compare the latter with
Analyze the steel data, Appendix D, Table D.5 for unusual observations. Determine the case diagnostics, added-variable and principal component plots, and compare the latter with the scatter-plots from Exercise 4.4. Recall the consequences of deleting case 3 on the collinearity indicatoes as examined in Exercise 5.2.
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