Frequencies for first 10,000 rows of mage36 variable in natl1986 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         51        0.51        0.51
          2 |        126        1.26        1.77
          3 |        226        2.26        4.03
          4 |        364        3.64        7.67
          5 |        520        5.20       12.87
          6 |        599        5.99       18.86
          7 |        662        6.62       25.48
          8 |        656        6.56       32.04
          9 |        628        6.28       38.32
         10 |        658        6.58       44.90
         11 |        686        6.86       51.76
         12 |        652        6.52       58.28
         13 |        613        6.13       64.41
         14 |        554        5.54       69.95
         15 |        539        5.39       75.34
         16 |        462        4.62       79.96
         17 |        400        4.00       83.96
         18 |        373        3.73       87.69
         19 |        294        2.94       90.63
         20 |        233        2.33       92.96
         21 |        202        2.02       94.98
         22 |        156        1.56       96.54
         23 |        118        1.18       97.72
         24 |         69        0.69       98.41
         25 |         54        0.54       98.95
         26 |         46        0.46       99.41
         27 |         28        0.28       99.69
         28 |         11        0.11       99.80
         29 |          8        0.08       99.88
         30 |          7        0.07       99.95
         31 |          2        0.02       99.97
         32 |          1        0.01       99.98
         33 |          1        0.01       99.99
         34 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016