Frequencies for first 10,000 rows of mage7 variable in natl1983 dataset :

     Age of |
     Mother |
   recode 7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         43        0.43        0.43
          2 |      1,955       19.55       19.98
          3 |      3,474       34.74       54.72
          4 |      2,884       28.84       83.56
          5 |      1,213       12.13       95.69
          6 |        371        3.71       99.40
          7 |         60        0.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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