Frequencies for first 10,000 rows of mage36 variable in natlterr1998 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         58        0.58        0.58
          2 |        155        1.55        2.13
          3 |        272        2.72        4.85
          4 |        416        4.16        9.01
          5 |        549        5.49       14.50
          6 |        603        6.03       20.53
          7 |        644        6.44       26.97
          8 |        700        7.00       33.97
          9 |        626        6.26       40.23
         10 |        631        6.31       46.54
         11 |        577        5.77       52.31
         12 |        545        5.45       57.76
         13 |        554        5.54       63.30
         14 |        509        5.09       68.39
         15 |        442        4.42       72.81
         16 |        433        4.33       77.14
         17 |        421        4.21       81.35
         18 |        353        3.53       84.88
         19 |        300        3.00       87.88
         20 |        276        2.76       90.64
         21 |        226        2.26       92.90
         22 |        192        1.92       94.82
         23 |        127        1.27       96.09
         24 |        125        1.25       97.34
         25 |         91        0.91       98.25
         26 |         54        0.54       98.79
         27 |         44        0.44       99.23
         28 |         30        0.30       99.53
         29 |         16        0.16       99.69
         30 |         19        0.19       99.88
         31 |          6        0.06       99.94
         32 |          3        0.03       99.97
         33 |          1        0.01       99.98
         34 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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