Frequencies for first 10,000 rows of dfage variable in natlterr1997 dataset :

     Age of |
     Father |      Freq.     Percent        Cum.
------------+-----------------------------------
         14 |          4        0.04        0.04
         15 |         20        0.20        0.24
         16 |         60        0.60        0.84
         17 |        122        1.22        2.06
         18 |        255        2.55        4.61
         19 |        423        4.23        8.84
         20 |        468        4.68       13.52
         21 |        569        5.69       19.21
         22 |        569        5.69       24.90
         23 |        601        6.01       30.91
         24 |        588        5.88       36.79
         25 |        610        6.10       42.89
         26 |        582        5.82       48.71
         27 |        546        5.46       54.17
         28 |        500        5.00       59.17
         29 |        450        4.50       63.67
         30 |        447        4.47       68.14
         31 |        406        4.06       72.20
         32 |        336        3.36       75.56
         33 |        315        3.15       78.71
         34 |        278        2.78       81.49
         35 |        261        2.61       84.10
         36 |        195        1.95       86.05
         37 |        176        1.76       87.81
         38 |        138        1.38       89.19
         39 |        146        1.46       90.65
         40 |         99        0.99       91.64
         41 |         87        0.87       92.51
         42 |         84        0.84       93.35
         43 |         70        0.70       94.05
         44 |         55        0.55       94.60
         45 |         43        0.43       95.03
         46 |         39        0.39       95.42
         47 |         44        0.44       95.86
         48 |         32        0.32       96.18
         49 |         25        0.25       96.43
         50 |         31        0.31       96.74
         51 |         18        0.18       96.92
         52 |         11        0.11       97.03
         53 |         12        0.12       97.15
         54 |          8        0.08       97.23
         55 |          4        0.04       97.27
         56 |          4        0.04       97.31
         57 |          8        0.08       97.39
         58 |          5        0.05       97.44
         59 |          2        0.02       97.46
         60 |          3        0.03       97.49
         62 |          1        0.01       97.50
         63 |          1        0.01       97.51
         64 |          2        0.02       97.53
         65 |          1        0.01       97.54
         66 |          3        0.03       97.57
         67 |          2        0.02       97.59
         69 |          1        0.01       97.60
         72 |          1        0.01       97.61
         73 |          1        0.01       97.62
         74 |          1        0.01       97.63
         99 |        237        2.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015