Frequencies for first 10,000 rows of mage6 variable in natl1981 dataset :

     Age of |
     Mother |
   recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,035       20.35       20.35
          2 |      3,537       35.37       55.72
          3 |      2,817       28.17       83.89
          4 |      1,215       12.15       96.04
          5 |        326        3.26       99.30
          6 |         70        0.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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