Frequencies for first 10,000 rows of mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 42 | 1 0.01 0.01 45 | 2 0.02 0.03 52 | 1 0.01 0.04 55 | 1 0.01 0.05 56 | 1 0.01 0.06 57 | 2 0.02 0.08 58 | 6 0.06 0.14 59 | 1 0.01 0.15 60 | 1 0.01 0.16 61 | 5 0.05 0.21 62 | 4 0.04 0.25 63 | 10 0.10 0.35 64 | 21 0.21 0.56 65 | 14 0.14 0.70 66 | 13 0.13 0.83 67 | 10 0.10 0.93 68 | 19 0.19 1.12 69 | 40 0.40 1.52 70 | 16 0.16 1.68 71 | 33 0.33 2.01 72 | 33 0.33 2.34 73 | 56 0.56 2.90 74 | 38 0.38 3.28 75 | 46 0.46 3.74 76 | 59 0.59 4.33 77 | 93 0.93 5.26 78 | 119 1.19 6.45 79 | 145 1.45 7.90 80 | 128 1.28 9.18 81 | 156 1.56 10.74 82 | 161 1.61 12.35 83 | 195 1.95 14.30 84 | 288 2.88 17.18 85 | 400 4.00 21.18 86 | 511 5.11 26.29 87 | 479 4.79 31.08 88 | 605 6.05 37.13 89 | 619 6.19 43.32 90 | 552 5.52 48.84 91 | 435 4.35 53.19 92 | 545 5.45 58.64 93 | 584 5.84 64.48 94 | 605 6.05 70.53 95 | 750 7.50 78.03 96 | 680 6.80 84.83 97 | 504 5.04 89.87 98 | 31 0.31 90.18 99 | 239 2.39 92.57 . | 743 7.43 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016