Frequencies for first 10,000 rows of mage7 variable in natl1972 dataset :

     Age of |
     Mother |
   recode 7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         74        0.74        0.74
          2 |      2,527       25.27       26.01
          3 |      3,739       37.39       63.40
          4 |      2,199       21.99       85.39
          5 |        922        9.22       94.61
          6 |        420        4.20       98.81
          7 |        119        1.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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