Statistics Homework Solutions 208

Statistics Homework Solutions 208 - 208 CHAPTER 8 134 28x10...

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Unformatted text preview: 208 CHAPTER 8 134 28x10 has Mallows’ C p equal to ¨ ¢ 0 67152x7 4 0. ¡ ¨ ¢ 1660 9 ¨ ¨ ¡ ¡ (e) The 2-variable model z (f) Using a value of 0 15 for both α-to-enter and α-to-remove, the equation chosen by stepwise regression is z 1660 9 0 67152x7 134 28x10 ¨ ¨ ¢ ¨ ¢ ¨ ¡ ¡ (g) The 17-variable model below has adjusted R2 equal to 0.97783. w 700 56 21 701x2 20 000x3 21 813x4 62 599x5 0 016156x7 0 012689x8 1 1315x9 15 245x10 1 1103x11 20 523x13 90 189x15 0 77442x16 7 5559x19 ¨ ¨ ¢ ¨ ¢ ¨ ¨ ¡ ¢ ¨ ¨ ¡ ¢ ¨ ¨ ¡ 271 32x23 ¨ ¡ ¨ ¡ ¢ 12 994x22 ¡ ¨ ¢ ¨ ¡ ¨ ¢ 7 5497x21 ¨ ¨ ¨ ¨ ¡ ¡ ¢ 5 9163x20 ¢ (h) The 13-variable model below has Mallows’ C p equal to 8.0. 567 06 23 582x2 16 766x3 90 482x5 0 0082274x7 0 011004x8 0 89554x9 12 131x10 11 984x13 0 67302x16 11 097x19 4 6448x20 11 108x22 217 82x23 ¨ ¨ ¢ ¨ ¨ ¡ ¨ ¢ ¡ ¨ ¢ ¢ ¨ ¨ ¢ ¢ ¨ ¨ ¨ ¡ ¨ ¡ ¨ ¡ ¨ ¡ ¡ w ¢ (i) Using a value of 0 15 for both α-to-enter and α-to-remove, the equation chosen by stepwise regression is w 130 92 28 085x2 113 49x5 0 16802x9 0 20216x16 11 417x19 12 068x21 78 371x23. ¨ ¨ ¡ ¨ ¢ ¨ ¢ ¨ ¡ ¨ ¢ ¨ ¢ ¨ ¡ ¨ ¡ ...
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This note was uploaded on 12/20/2011 for the course STA 3163 taught by Professor Mattgilg during the Fall '11 term at UNF.

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