Question: Repeat Problem 9.4 without centering the regressors and compare the results. Which approach do you think is better? Data From Problem 9.4 Find the condition

Repeat Problem 9.4 without centering the regressors and compare the results. Which approach do you think is better?

Data From Problem 9.4

Find the condition indices and the variance decomposition proportions for the Hald cement data (Table B.21), assuming centered regressors. What can you say about multicollinearity in these data?

Observation i Yi x12 Xiz 12345678 78.5 7 26 6 60 74.3

Observation i Yi x12 Xiz 12345678 78.5 7 26 6 60 74.3 1 29 15 52 104.3 11 56 8 20 876 11 31 8 47 95.9 7 52 6 33 109.2 11 55 102.7 3 71 72.5 1 31 9 93.1 2 54 10 115.9 21 47 11 83.8 1 40 12 113.3 11 66 13 109.4 10 68 978143100 22 6 22 44 22 26 23 34 12 12

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