Frequencies for first 10,000 rows of mage7 variable in natl1975 dataset :

     Age of |
     Mother |
   recode 7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         69        0.69        0.69
          2 |      2,580       25.80       26.49
          3 |      3,575       35.75       62.24
          4 |      2,441       24.41       86.65
          5 |        931        9.31       95.96
          6 |        314        3.14       99.10
          7 |         90        0.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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