Frequencies for first 10,000 rows of mage6 variable in natl1988 dataset :

     Age of |
     Mother |
   recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,870       18.70       18.70
          2 |      3,233       32.33       51.03
          3 |      2,841       28.41       79.44
          4 |      1,554       15.54       94.98
          5 |        446        4.46       99.44
          6 |         56        0.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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