Frequencies for first 10,000 rows of mage8 variable in natl1980 dataset :

     Age of |
     Mother |
   recode 8 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         62        0.62        0.62
          2 |      2,056       20.56       21.18
          3 |      3,590       35.90       57.08
          4 |      2,680       26.80       83.88
          5 |      1,207       12.07       95.95
          6 |        339        3.39       99.34
          7 |         61        0.61       99.95
          8 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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