Frequencies for first 10,000 rows of mage8 variable in natl1971 dataset :

     Age of |
     Mother |
   recode 8 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         54        0.54        0.54
          2 |      2,309       23.09       23.63
          3 |      3,904       39.04       62.67
          4 |      2,230       22.30       84.97
          5 |        956        9.56       94.53
          6 |        402        4.02       98.55
          7 |        139        1.39       99.94
          8 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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