Frequencies for first 10,000 rows of dfage variable in natlterr2002 dataset :

     Age of |
     Father |      Freq.     Percent        Cum.
------------+-----------------------------------
         14 |          1        0.01        0.01
         15 |         11        0.11        0.12
         16 |         37        0.37        0.49
         17 |        105        1.05        1.54
         18 |        249        2.49        4.03
         19 |        375        3.75        7.78
         20 |        468        4.68       12.46
         21 |        562        5.62       18.08
         22 |        556        5.56       23.64
         23 |        591        5.91       29.55
         24 |        589        5.89       35.44
         25 |        615        6.15       41.59
         26 |        503        5.03       46.62
         27 |        529        5.29       51.91
         28 |        484        4.84       56.75
         29 |        468        4.68       61.43
         30 |        442        4.42       65.85
         31 |        445        4.45       70.30
         32 |        374        3.74       74.04
         33 |        350        3.50       77.54
         34 |        296        2.96       80.50
         35 |        262        2.62       83.12
         36 |        233        2.33       85.45
         37 |        198        1.98       87.43
         38 |        154        1.54       88.97
         39 |        140        1.40       90.37
         40 |        113        1.13       91.50
         41 |         87        0.87       92.37
         42 |        101        1.01       93.38
         43 |         78        0.78       94.16
         44 |         51        0.51       94.67
         45 |         47        0.47       95.14
         46 |         45        0.45       95.59
         47 |         29        0.29       95.88
         48 |         20        0.20       96.08
         49 |         14        0.14       96.22
         50 |         20        0.20       96.42
         51 |         15        0.15       96.57
         52 |         15        0.15       96.72
         53 |          9        0.09       96.81
         54 |         14        0.14       96.95
         55 |         10        0.10       97.05
         56 |          6        0.06       97.11
         57 |          4        0.04       97.15
         58 |          7        0.07       97.22
         59 |          3        0.03       97.25
         61 |          2        0.02       97.27
         62 |          2        0.02       97.29
         63 |          2        0.02       97.31
         64 |          2        0.02       97.33
         68 |          2        0.02       97.35
         69 |          1        0.01       97.36
         71 |          1        0.01       97.37
         72 |          1        0.01       97.38
         73 |          1        0.01       97.39
         99 |        261        2.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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