* IBELL's Telephone Service(76 Quarters:19 Years); data ibell; label price='the Price Charged for Long-Distance Calls' quantity='the Number of Long-Distance Calls' perinc='the Local Average Personal Income'; quarter price quantity perinc --------------------------------- 1 1.15 7543 52573 2 1.14 7235 53521 3 1.13 7054 53814 4 1.12 7287 54752 5 1.12 7056 55000 6 1.11 7907 55759 7 1.11 7368 55864 8 1.10 8418 56055 9 1.09 7395 56327 10 1.09 7919 56541 11 1.08 8719 56545 12 1.08 8303 57260 13 1.08 8499 58309 14 1.08 8761 59127 15 1.08 9190 59883 16 1.07 8889 60208 17 1.06 9226 61116 18 1.06 9316 61480 19 1.06 10219 62612 20 1.06 10310 63202 21 1.04 10213 63606 22 1.04 10656 64293 23 1.02 11730 64552 24 1.02 11326 65122 25 1.01 11435 66076 26 1.01 11311 66729 27 1.00 12428 67289 28 0.99 13432 67929 29 0.99 13981 69261 30 0.98 11877 70160 31 0.98 15079 70493 32 0.98 13796 70761 33 0.97 12453 70767 34 0.97 13564 70584 35 0.97 13260 70796 36 0.96 12530 70859 37 0.95 13554 70411 38 0.94 15052 70910 39 0.94 14035 71091 40 0.94 13726 70462 41 0.94 14444 70983 42 0.94 15437 71492 43 0.93 14521 70911 44 0.93 14534 70910 45 0.93 15577 72051 46 0.92 14411 71347 47 0.92 14964 72453 48 0.92 15696 73639 49 0.91 14452 73350 50 0.91 16495 72767 51 0.91 16805 72251 52 0.90 15427 72093 53 0.90 16293 70907 54 0.90 15706 71558 55 0.90 17609 71246 56 0.90 16888 70489 57 0.90 17101 70417 58 0.90 18660 71320 59 0.89 15149 71038 60 0.89 16167 70358 61 0.89 16807 70478 62 0.89 18132 70572 63 0.89 17440 71124 64 0.89 18441 71318 65 0.88 17110 71776 66 0.88 17193 71406 67 0.87 19973 72068 68 0.86 17842 73084 69 0.85 16527 73558 70 0.85 19352 73913 71 0.85 19725 74514 72 0.83 20734 75678 73 0.82 18911 75855 74 0.80 20310 75356 75 0.79 21191 75570 76 0.78 22116 75247