Frequencies for first 10,000 rows of mod_year variable in vehicle dataset : Model Year | Freq. Percent Cum. ------------+----------------------------------- 1 | 22 0.22 0.22 30 | 1 0.01 0.23 39 | 1 0.01 0.24 42 | 1 0.01 0.25 45 | 1 0.01 0.26 46 | 2 0.02 0.28 47 | 4 0.04 0.32 48 | 5 0.05 0.37 49 | 4 0.04 0.41 50 | 6 0.06 0.47 51 | 5 0.05 0.52 52 | 4 0.04 0.56 53 | 10 0.10 0.66 54 | 10 0.10 0.76 55 | 11 0.11 0.87 56 | 22 0.22 1.09 57 | 31 0.31 1.40 58 | 19 0.19 1.59 59 | 32 0.32 1.91 60 | 31 0.31 2.22 61 | 28 0.28 2.50 62 | 63 0.63 3.13 63 | 110 1.10 4.23 64 | 148 1.48 5.71 65 | 222 2.22 7.93 66 | 261 2.61 10.54 67 | 256 2.56 13.10 68 | 354 3.54 16.64 69 | 452 4.52 21.16 70 | 478 4.78 25.94 71 | 499 4.99 30.93 72 | 678 6.78 37.71 73 | 712 7.12 44.83 74 | 688 6.88 51.71 75 | 537 5.37 57.08 76 | 733 7.33 64.41 77 | 784 7.84 72.25 78 | 1,002 10.02 82.27 79 | 1,103 11.03 93.30 80 | 577 5.77 99.07 81 | 23 0.23 99.30 99 | 70 0.70 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Apr 2016