Frequencies for first 10,000 rows of mage7 variable in natl1974 dataset :

     Age of |
     Mother |
   recode 7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         79        0.79        0.79
          2 |      2,633       26.33       27.12
          3 |      3,575       35.75       62.87
          4 |      2,370       23.70       86.57
          5 |        897        8.97       95.54
          6 |        327        3.27       98.81
          7 |        119        1.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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