Frequencies for first 10,000 rows of mage7 variable in natl1969 dataset :

     Age of |
     Mother |
   recode 7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         63        0.63        0.63
          2 |      2,269       22.69       23.32
          3 |      3,706       37.06       60.38
          4 |      2,214       22.14       82.52
          5 |      1,071       10.71       93.23
          6 |        509        5.09       98.32
          7 |        168        1.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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