Frequencies for first 10,000 rows of mod_year variable in person dataset : Model Year | Freq. Percent Cum. ------------+----------------------------------- 24 | 1 0.01 0.01 40 | 1 0.01 0.02 50 | 1 0.01 0.03 53 | 2 0.02 0.05 54 | 1 0.01 0.06 55 | 3 0.03 0.09 56 | 2 0.02 0.11 58 | 6 0.06 0.17 59 | 4 0.04 0.21 60 | 6 0.06 0.27 61 | 3 0.03 0.30 62 | 16 0.16 0.46 63 | 11 0.11 0.57 64 | 24 0.24 0.81 65 | 38 0.38 1.19 66 | 38 0.38 1.57 67 | 31 0.31 1.88 68 | 56 0.56 2.44 69 | 80 0.80 3.24 70 | 81 0.81 4.05 71 | 98 0.98 5.03 72 | 163 1.63 6.66 73 | 158 1.58 8.24 74 | 181 1.81 10.05 75 | 156 1.56 11.61 76 | 309 3.09 14.70 77 | 298 2.98 17.68 78 | 440 4.40 22.08 79 | 487 4.87 26.95 80 | 392 3.92 30.87 81 | 423 4.23 35.10 82 | 423 4.23 39.33 83 | 398 3.98 43.31 84 | 615 6.15 49.46 85 | 692 6.92 56.38 86 | 673 6.73 63.11 87 | 691 6.91 70.02 88 | 750 7.50 77.52 89 | 852 8.52 86.04 90 | 463 4.63 90.67 91 | 29 0.29 90.96 99 | 158 1.58 92.54 . | 746 7.46 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016