Frequencies for first 10,000 rows of dfage variable in natl1995 dataset : Age of | Father | Freq. Percent Cum. ------------+----------------------------------- 14 | 1 0.01 0.01 15 | 5 0.05 0.06 16 | 20 0.20 0.26 17 | 60 0.60 0.86 18 | 96 0.96 1.82 19 | 163 1.63 3.45 20 | 225 2.25 5.70 21 | 231 2.31 8.01 22 | 348 3.48 11.49 23 | 394 3.94 15.43 24 | 395 3.95 19.38 25 | 418 4.18 23.56 26 | 432 4.32 27.88 27 | 427 4.27 32.15 28 | 425 4.25 36.40 29 | 424 4.24 40.64 30 | 461 4.61 45.25 31 | 430 4.30 49.55 32 | 380 3.80 53.35 33 | 337 3.37 56.72 34 | 277 2.77 59.49 35 | 245 2.45 61.94 36 | 223 2.23 64.17 37 | 165 1.65 65.82 38 | 138 1.38 67.20 39 | 150 1.50 68.70 40 | 106 1.06 69.76 41 | 64 0.64 70.40 42 | 59 0.59 70.99 43 | 37 0.37 71.36 44 | 30 0.30 71.66 45 | 35 0.35 72.01 46 | 22 0.22 72.23 47 | 16 0.16 72.39 48 | 18 0.18 72.57 49 | 11 0.11 72.68 50 | 8 0.08 72.76 51 | 6 0.06 72.82 52 | 5 0.05 72.87 53 | 7 0.07 72.94 54 | 3 0.03 72.97 56 | 1 0.01 72.98 59 | 1 0.01 72.99 62 | 1 0.01 73.00 68 | 1 0.01 73.01 71 | 1 0.01 73.02 99 | 2,698 26.98 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Dec 2015