Frequencies for first 10,000 rows of mage15 variable in natl1988 dataset :

     Age of |
     Mother |
  recode 15 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         53        0.53        0.53
          3 |        115        1.15        1.68
          4 |        241        2.41        4.09
          5 |        375        3.75        7.84
          6 |        502        5.02       12.86
          7 |        584        5.84       18.70
          9 |        623        6.23       24.93
         10 |        588        5.88       30.81
         11 |        642        6.42       37.23
         12 |        698        6.98       44.21
         13 |        682        6.82       51.03
         14 |      2,841       28.41       79.44
         15 |      1,554       15.54       94.98
         16 |        446        4.46       99.44
         17 |         56        0.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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