Frequencies for first 10,000 rows of mage6 variable in natl1977 dataset :

     Age of |
     Mother |
   recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,516       25.16       25.16
          2 |      3,569       35.69       60.85
          3 |      2,505       25.05       85.90
          4 |        985        9.85       95.75
          5 |        330        3.30       99.05
          6 |         95        0.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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