Frequencies for first 10,000 rows of mage7 variable in natl1982 dataset :

     Age of |
     Mother |
   recode 7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         56        0.56        0.56
          2 |      1,915       19.15       19.71
          3 |      3,571       35.71       55.42
          4 |      2,782       27.82       83.24
          5 |      1,266       12.66       95.90
          6 |        345        3.45       99.35
          7 |         65        0.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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