1. Coding and Descriptive Statistics

2. The Eight Queens Problem You must find a solution that places eight queens on the chessboard below so that no queen can capture any other queen. If you are a chess player, you already know that a queen can move in a straight line any number of spaces horizontally, vertically, or diagonally. Good luck.

3. Descriptives Correlations and Descriptives /comment *There were 7,476,814 units shipped in 1991 comprising 1703 models* -> CORRELATIONS -> /VARIABLES=nomresid firmage inddmdch inddemd znichdis zxnchdst nichesw -> znclock nclock pctahead pctbehnd aclock nichsize sqniche xnchsize nmunifch -> stblriv

4. Descriptives -> /PRINT=TWOTAIL SIG -> /STATISTICS DESCRIPTIVES -> /MISSING=PAIRWISE.

5. Descriptives Variable Cases Mean Std Dev NOMRESID 2154.0031.0188 FIRMAGE 2132 3.1796 3.3656 INDDMDCH 2075.2195.2703 INDDEMD 2132 13917212.3520 4904283.5921 ZNICHDIS 2132.0000.9979 ZXNCHDST 2132.0000.9979

6. Descriptives NICHESW 2132.3973.4894 ZNCLOCK 1599.0000.9915 NCLOCK 2132 1.6313 1.0560 PCTAHEAD 2132.0283.0793 PCTBEHND 2132.7702.3853 ACLOCK 2132 1.5929 1.1842 NICHSIZE 2132 73.7533 34.7859 SQNICHE 2132 6649.0394 5549.3028 XNCHSIZE 2132 165.1764 72.5831 NMUNIFCH 1599 1.9774 2.1503 STBLRIV 2132.3555.2558

7. Descriptives - - Correlation Coefficients - - NOMRESID FIRMAGE INDDMDCH INDDEMD ZNICHDIS ZXNCHDST XNCHSIZE -.0785.0753 -.6214.7867 -.0626.2423 ( 2131) ( 2132) ( 2052) ( 2132) ( 2132) ( 2132) P=.000 P=.001 P=.000 P=.000 P=.004 P=.000 NMUNIFCH.0214.0177.0700.0875.0216.0312 ( 1598) ( 1599) ( 1599) ( 1599) ( 1599) ( 1599) P=.393 P=.479 P=.005 P=.000 P=.388 P=.213 STBLRIV -.0426 -.0829.3072 -.2503 -.1156 -.1853 ( 2131) ( 2132) ( 2052) ( 2132) ( 2132) ( 2132) P=.049 P=.000 P=.000 P=.000 P=.000 P=.000 (Coefficient / (Cases) / 2-tailed Significance) ". " is printed if a coefficient cannot be computed

8. ALTPROC alternate processor designation 1987 Valid Cum Value Label Value Frequency Percent Percent Percent 3.2.2.2 11/23 1.1.1.3 2901 1.1.1.4 29116 1.1.1.5 32016 1.1.1.5 6089 1.1.1.6 6120 2.2.2.8 6301 1.1.1.9 6502 20 1.6 1.6 2.4 6504 1.1.1 2.5 6510 2.2.2 2.7 65C816 1.1.1 2.7 6602 1.1.1 2.8 6800 6.5.5 3.3 68000 43 3.4 3.4 6.6 68008 1.1.1 6.7

9. Valid Cum Value Label Value Frequency Percent Percent Percent 68009 2.2.2 6.9 68010 15 1.2 1.2 8.0 6802 1.1.1 8.1 68020 10.8.8 8.9 6805 3.2.2 9.1 6809 5.4.4 9.5 6810 1.1.1 9.6 780B 1.1.1 9.7 80186 30 2.3 2.3 12.0 80286 331 25.8 25.8 37.8 80386 142 11.1 11.1 48.9 80386SX 4.3.3 49.2 80486 2.2.2 49.4 8085 23 1.8 1.8 51.2 8085A 2.2.2 51.3 8086 81 6.3 6.3 57.6 8087 3.2.2 57.9

10. Descriptives 8088 296 23.1 23.1 81.0 8088A 2.2.2 81.1 86000 1.1.1 81.2 8X305 1.1.1 81.3 9445 4.3.3 81.6 9900 1.1.1 81.7 ACS-09 1.1.1 81.7 APPLE 1.1.1 81.8 CHI 1.1.1 81.9 GOULD 2.2.2 82.1 LISP 2.2.2 82.2 LSI11 2.2.2 82.4 NA 1.1.1 82.4 PANDA 1.1.1 82.5 PRO 28 2.2 2.2 84.7 T11 2.2.2 84.9 V20 12.9.9 85.8 V30 6.5.5 86.3 V40 4.3.3 86.6 Z80 110 8.6 8.6 95.2 Z80A 51 4.0 4.0 99.1 Z80B 11.9.9 100.0 ------- ------- ------- Total 1282 100.0 100.0 Valid cases 1282 Missing cases 0

11. Mean # of PC Models by Lifespan 0 1 2 3 4 5 6 7 8 12345678910111213151920 Number of years that a firm shipped PCs 1969 - 1991 Source: IDC