Frequencies for first 10,000 rows of mage12 variable in natl1998 dataset :

     Age of |
     Mother |
  recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         49        0.49        0.49
          3 |         93        0.93        1.42
          4 |        220        2.20        3.62
          5 |        354        3.54        7.16
          6 |        519        5.19       12.35
          7 |        592        5.92       18.27
          8 |      3,072       30.72       48.99
          9 |      2,674       26.74       75.73
         10 |      1,591       15.91       91.64
         11 |        698        6.98       98.62
         12 |        133        1.33       99.95
         13 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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