Frequencies for first 10,000 rows of mage15 variable in natl1986 dataset :

     Age of |
     Mother |
  recode 15 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         51        0.51        0.51
          3 |        126        1.26        1.77
          4 |        226        2.26        4.03
          5 |        364        3.64        7.67
          6 |        520        5.20       12.87
          7 |        599        5.99       18.86
          9 |        662        6.62       25.48
         10 |        656        6.56       32.04
         11 |        628        6.28       38.32
         12 |        658        6.58       44.90
         13 |        686        6.86       51.76
         14 |      2,820       28.20       79.96
         15 |      1,502       15.02       94.98
         16 |        443        4.43       99.41
         17 |         59        0.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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