Frequencies for first 10,000 rows of mage7 variable in natl1985 dataset :

     Age of |
     Mother |
   recode 7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         53        0.53        0.53
          2 |      1,841       18.41       18.94
          3 |      3,457       34.57       53.51
          4 |      2,776       27.76       81.27
          5 |      1,414       14.14       95.41
          6 |        403        4.03       99.44
          7 |         56        0.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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