Frequencies for first 10,000 rows of mod_year variable in vehicle dataset : Model Year | Freq. Percent Cum. ------------+----------------------------------- 23 | 1 0.01 0.01 40 | 2 0.02 0.03 42 | 1 0.01 0.04 45 | 1 0.01 0.05 46 | 1 0.01 0.06 47 | 1 0.01 0.07 48 | 2 0.02 0.09 49 | 3 0.03 0.12 50 | 1 0.01 0.13 51 | 2 0.02 0.15 52 | 2 0.02 0.17 53 | 1 0.01 0.18 54 | 4 0.04 0.22 55 | 6 0.06 0.28 56 | 9 0.09 0.37 57 | 2 0.02 0.39 58 | 8 0.08 0.47 59 | 7 0.07 0.54 60 | 7 0.07 0.61 61 | 15 0.15 0.76 62 | 24 0.24 1.00 63 | 32 0.32 1.32 64 | 40 0.40 1.72 65 | 67 0.67 2.39 66 | 77 0.77 3.16 67 | 88 0.88 4.04 68 | 95 0.95 4.99 69 | 156 1.56 6.55 70 | 163 1.63 8.18 71 | 200 2.00 10.18 72 | 277 2.77 12.95 73 | 325 3.25 16.20 74 | 371 3.71 19.91 75 | 294 2.94 22.85 76 | 434 4.34 27.19 77 | 505 5.05 32.24 78 | 622 6.22 38.46 79 | 636 6.36 44.82 80 | 502 5.02 49.84 81 | 477 4.77 54.61 82 | 523 5.23 59.84 83 | 492 4.92 64.76 84 | 732 7.32 72.08 85 | 832 8.32 80.40 86 | 960 9.60 90.00 87 | 671 6.71 96.71 88 | 29 0.29 97.00 99 | 300 3.00 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016