Frequencies for first 10,000 rows of mage8 variable in natl1990 dataset :

     Age of |
     Mother |
   recode 8 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         46        0.46        0.46
          2 |      1,840       18.40       18.86
          3 |      3,117       31.17       50.03
          4 |      2,862       28.62       78.65
          5 |      1,555       15.55       94.20
          6 |        510        5.10       99.30
          7 |         70        0.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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