Frequencies for first 10,000 rows of dfage variable in natlterr1994 dataset :

     Age of |
     Father |      Freq.     Percent        Cum.
------------+-----------------------------------
         11 |          1        0.01        0.01
         13 |          1        0.01        0.02
         14 |          3        0.03        0.05
         15 |         15        0.15        0.20
         16 |         60        0.60        0.80
         17 |        127        1.27        2.07
         18 |        275        2.75        4.82
         19 |        367        3.67        8.49
         20 |        487        4.87       13.36
         21 |        524        5.24       18.60
         22 |        618        6.18       24.78
         23 |        644        6.44       31.22
         24 |        607        6.07       37.29
         25 |        626        6.26       43.55
         26 |        510        5.10       48.65
         27 |        589        5.89       54.54
         28 |        536        5.36       59.90
         29 |        457        4.57       64.47
         30 |        438        4.38       68.85
         31 |        390        3.90       72.75
         32 |        361        3.61       76.36
         33 |        312        3.12       79.48
         34 |        269        2.69       82.17
         35 |        237        2.37       84.54
         36 |        203        2.03       86.57
         37 |        186        1.86       88.43
         38 |        137        1.37       89.80
         39 |        130        1.30       91.10
         40 |        109        1.09       92.19
         41 |         83        0.83       93.02
         42 |         77        0.77       93.79
         43 |         70        0.70       94.49
         44 |         67        0.67       95.16
         45 |         41        0.41       95.57
         46 |         45        0.45       96.02
         47 |         35        0.35       96.37
         48 |         18        0.18       96.55
         49 |         32        0.32       96.87
         50 |         25        0.25       97.12
         51 |         26        0.26       97.38
         52 |         12        0.12       97.50
         53 |         16        0.16       97.66
         54 |          9        0.09       97.75
         55 |          6        0.06       97.81
         56 |          6        0.06       97.87
         57 |          6        0.06       97.93
         58 |          1        0.01       97.94
         59 |         10        0.10       98.04
         60 |          2        0.02       98.06
         62 |          5        0.05       98.11
         63 |          5        0.05       98.16
         64 |          4        0.04       98.20
         65 |          2        0.02       98.22
         67 |          1        0.01       98.23
         68 |          2        0.02       98.25
         69 |          1        0.01       98.26
         71 |          1        0.01       98.27
         74 |          1        0.01       98.28
         99 |        172        1.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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