Frequencies for first 10,000 rows of mage8 variable in natlterr1999 dataset :

     Age of |
     Mother |
   recode 8 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         72        0.72        0.72
          2 |      1,986       19.86       20.58
          3 |      3,198       31.98       52.56
          4 |      2,461       24.61       77.17
          5 |      1,513       15.13       92.30
          6 |        644        6.44       98.74
          7 |        122        1.22       99.96
          8 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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