Frequencies for first 10,000 rows of mod_year variable in vehicle dataset : Model Year | Freq. Percent Cum. ------------+----------------------------------- 41 | 2 0.02 0.02 42 | 1 0.01 0.03 45 | 1 0.01 0.04 46 | 4 0.04 0.08 47 | 1 0.01 0.09 48 | 10 0.10 0.19 49 | 5 0.05 0.24 50 | 3 0.03 0.27 51 | 8 0.08 0.35 52 | 5 0.05 0.40 53 | 7 0.07 0.47 54 | 3 0.03 0.50 55 | 13 0.13 0.63 56 | 15 0.15 0.78 57 | 12 0.12 0.90 58 | 19 0.19 1.09 59 | 22 0.22 1.31 60 | 26 0.26 1.57 61 | 26 0.26 1.83 62 | 48 0.48 2.31 63 | 65 0.65 2.96 64 | 100 1.00 3.96 65 | 185 1.85 5.81 66 | 198 1.98 7.79 67 | 220 2.20 9.99 68 | 232 2.32 12.31 69 | 310 3.10 15.41 70 | 390 3.90 19.31 71 | 388 3.88 23.19 72 | 534 5.34 28.53 73 | 665 6.65 35.18 74 | 608 6.08 41.26 75 | 494 4.94 46.20 76 | 600 6.00 52.20 77 | 709 7.09 59.29 78 | 855 8.55 67.84 79 | 884 8.84 76.68 80 | 759 7.59 84.27 81 | 795 7.95 92.22 82 | 483 4.83 97.05 83 | 20 0.20 97.25 99 | 275 2.75 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016