Frequencies for first 10,000 rows of mage6 variable in natl1987 dataset :

     Age of |
     Mother |
   recode 6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,901       19.01       19.01
          2 |      3,227       32.27       51.28
          3 |      2,923       29.23       80.51
          4 |      1,455       14.55       95.06
          5 |        447        4.47       99.53
          6 |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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