DATA AIR; TITLE 'AIRLINE FLIGHTS DATA, CH 8, PROBLEM 4';
INPUT CITY1 $   CITY2 $ PASS MILES INM INS POPM POPS AIRL;
PASS=PASS/1000;
*** comment:
        these statements create logarithms using the SAS System
***;
array x pass -- airl;
array y lpass lmiles linm lins lpopm lpops lairl;
do over x; y = log(x);  end;
CARDS;
ATL AGST 3546 141 3.246 2.606 1270 279 3
ATL BHM 7016 139 3.246 2.637 1270 738 4
ATL CHIC 13300 588 3.982 3.246 6587 1270 5
ATL CHST 5637 226 3.246 3.16 1270 375 5
ATL CLBS 3630 193 3.246 2.569 1270 299 4
ATL CLE 3891 555 3.559 3.246 2072 1270 3
ATL DALL 6776 719 3.201 3.245 1359 1270 2
ATL DC 9443 543 3.524 3.246 2637 1270 5
ATL DETR 5262 597 3.695 3.246 4063 1270 4
ATL JAX 8339 285 3.246 2.774 1270 505 4
ATL LA 5657 1932 3.759 3.246 7079 1270 3
ATL MEM 6286 336 3.246 2.552 1270 755 3
ATL NO 7058 424 3.245 2.876 1270 1050 4
ATL NVL 5423 214 3.246 2.807 1270 534 3
ATL ORL 4259 401 3.246 2.509 1270 379 3
ATL PHIL 6040 666 3.243 3.246 4690 1270 5
ATL PIT 3345 521 3.125 3.246 2413 1270 2
ATL RAL 3371 350 3.246 2.712 1270 198 3
ATL SF 4624 2135 3.977 3.246 3075 1270 3
ATL SVNH 3669 223 3.246 2.484 1270 188 1
ATL TPA 7463 413 3.246 2.586 1270 881 5
DC NYC 150970 205 3.962 2.524 11698 2637 12
LA BOSTN 16397 2591 3.759 3.423 7079 3516 4
LA CHIC 55681 1742 3.759 3.982 7079 6587 5
LA DALL 18222 1238 3.759 3.201 7079 1359 3
LA DC 20548 2296 3.759 3.524 7079 2637 5
LA DENV 22745 830 3.759 3.233 7079 1088 4
LA DETR 17967 1979 3.759 3.965 7079 4063 4
LA NYC 79450 2446 3.962 3.759 11698 7079 5
LA PHIL 14705 2389 3.759 3.243 7079 4690 5
LA PHNX 29002 356 3.759 2.841 7079 837 5
LA SACR 24896 361 3.759 3.477 7079 685 3
LA SEAT 33257 960 3.759 3.722 7079 1239 2
MIA ATL 14242 605 3.246 3.024 1270 1142 4
MIA BOSTN 21648 1257 3.423 3.024 3516 1142 5
MIA CHIC 39316 1190 3.982 3.124 6587 1142 5
MIA CLE 13669 1089 3.559 3.124 2072 1142 4
MIA DC 14499 925 3.524 3.024 2637 1142 6
MIA DETR 18537 1155 3.695 3.024 4063 1142 5
MIA NYC 126134 1094 3.962 3.024 11698 1142 7
MIA PHIL 21117 1021 3.243 3.024 4690 1142 7
MIA TPA 18674 205 3.024 2.586 1142 881 7
NYC ATL 26919 748 3.962 3.246 11698 1270 5
NYC BOSTN 189506 188 3.962 3.423 11698 3516 8
NYC BUF 43179 291 3.962 3.155 11698 1325 4
NYC CHIC 140445 711 3.962 3.982 11698 6587 7
NYC CLE 53620 404 3.962 3.559 11698 2072 7
NYC DETR 66737 480 3.962 3.695 11698 4063 8
NYC PIT 53580 315 3.962 3.125 11698 2413 7
NYC RCH 31681 249 3.962 3.532 11698 825 3
NYC STL 27380 873 3.962 3.276 11698 2320 5
NYC SYR 32502 193 3.962 2.974 11698 515 3
SANDG CHIC 6162 1731 3.982 3.149 6587 1173 3
SANDG DALL 2592 1181 3.201 3.149 1359 1173 2
SANDG DC 3211 2271 3.524 3.149 2637 1173 4
SANDG LA 21642 111 3.759 3.149 7079 1173 4
SANDG LVEG 2760 265 3.149 3.821 1173 179 5
SANDG MINP 2776 1532 3.621 3.149 1649 1173 2
SANDG NYC 6304 2429 3.962 3.149 11698 1173 4
SANDG PHNX 6027 298 3.149 2.841 1173 837 3
SANDG SACR 2603 473 3.149 3.477 1173 685 3
SANDG SEAT 4857 1064 3.722 3.149 1239 1173 2
SF BOSTN 11933 2693 3.423 3.977 3516 3075 4
SF CHIC 33946 1854 3.982 3.977 6587 3075 4
SF DC 16743 2435 3.977 3.524 3075 2637 5
SF DENV 14742 947 3.977 3.233 3075 1088 3
SF LA 148366 347 3.759 3.977 7079 3075 7
SF LVEG 16267 416 3.977 3.821 3075 179 6
SF LVEG 9410 458 3.977 3.149 3075 1173 5
SF NYC 57863 2566 3.962 3.977 11698 3075 5
SF PORT 23420 535 3.977 3.305 3075 914 4
SF RENO 18400 185 3.977 3.899 3075 109 3
SF SEAT 41725 679 3.977 3.722 3075 1239 3
SF SLC 11994 598 3.977 2.721 3075 526 3