Frequencies for first 10,000 rows of dfage variable in natlterr1998 dataset :

     Age of |
     Father |      Freq.     Percent        Cum.
------------+-----------------------------------
         15 |         15        0.15        0.15
         16 |         45        0.45        0.60
         17 |        125        1.25        1.85
         18 |        222        2.22        4.07
         19 |        383        3.83        7.90
         20 |        515        5.15       13.05
         21 |        579        5.79       18.84
         22 |        577        5.77       24.61
         23 |        571        5.71       30.32
         24 |        561        5.61       35.93
         25 |        611        6.11       42.04
         26 |        598        5.98       48.02
         27 |        581        5.81       53.83
         28 |        490        4.90       58.73
         29 |        458        4.58       63.31
         30 |        422        4.22       67.53
         31 |        429        4.29       71.82
         32 |        385        3.85       75.67
         33 |        313        3.13       78.80
         34 |        270        2.70       81.50
         35 |        243        2.43       83.93
         36 |        207        2.07       86.00
         37 |        167        1.67       87.67
         38 |        154        1.54       89.21
         39 |        138        1.38       90.59
         40 |        123        1.23       91.82
         41 |         95        0.95       92.77
         42 |         68        0.68       93.45
         43 |         58        0.58       94.03
         44 |         50        0.50       94.53
         45 |         39        0.39       94.92
         46 |         50        0.50       95.42
         47 |         33        0.33       95.75
         48 |         19        0.19       95.94
         49 |         29        0.29       96.23
         50 |         23        0.23       96.46
         51 |         17        0.17       96.63
         52 |         14        0.14       96.77
         53 |          6        0.06       96.83
         54 |          6        0.06       96.89
         55 |         15        0.15       97.04
         56 |          9        0.09       97.13
         57 |          7        0.07       97.20
         58 |          6        0.06       97.26
         59 |          7        0.07       97.33
         60 |          3        0.03       97.36
         61 |          4        0.04       97.40
         62 |          2        0.02       97.42
         64 |          1        0.01       97.43
         65 |          4        0.04       97.47
         67 |          1        0.01       97.48
         68 |          1        0.01       97.49
         69 |          1        0.01       97.50
         71 |          1        0.01       97.51
         99 |        249        2.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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