Frequencies for first 10,000 rows of mage36 variable in natl1976 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         81        0.81        0.81
          2 |        193        1.93        2.74
          3 |        356        3.56        6.30
          4 |        603        6.03       12.33
          5 |        660        6.60       18.93
          6 |        761        7.61       26.54
          7 |        773        7.73       34.27
          8 |        742        7.42       41.69
          9 |        692        6.92       48.61
         10 |        679        6.79       55.40
         11 |        608        6.08       61.48
         12 |        589        5.89       67.37
         13 |        586        5.86       73.23
         14 |        481        4.81       78.04
         15 |        445        4.45       82.49
         16 |        376        3.76       86.25
         17 |        298        2.98       89.23
         18 |        212        2.12       91.35
         19 |        172        1.72       93.07
         20 |        171        1.71       94.78
         21 |        110        1.10       95.88
         22 |         88        0.88       96.76
         23 |         81        0.81       97.57
         24 |         66        0.66       98.23
         25 |         56        0.56       98.79
         26 |         44        0.44       99.23
         27 |         17        0.17       99.40
         28 |         26        0.26       99.66
         29 |         11        0.11       99.77
         30 |         12        0.12       99.89
         31 |          5        0.05       99.94
         32 |          4        0.04       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