Frequencies for first 10,000 rows of mage8 variable in natl1978 dataset :

     Age of |
     Mother |
   recode 8 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         73        0.73        0.73
          2 |      2,253       22.53       23.26
          3 |      3,599       35.99       59.25
          4 |      2,522       25.22       84.47
          5 |      1,165       11.65       96.12
          6 |        325        3.25       99.37
          7 |         59        0.59       99.96
          8 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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