Frequencies for first 10,000 rows of mage8 variable in natl1973 dataset :

     Age of |
     Mother |
   recode 8 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         78        0.78        0.78
          2 |      2,703       27.03       27.81
          3 |      3,471       34.71       62.52
          4 |      2,316       23.16       85.68
          5 |        925        9.25       94.93
          6 |        396        3.96       98.89
          7 |        106        1.06       99.95
          8 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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