Frequencies for first 10,000 rows of mage8 variable in natlterr1997 dataset :

     Age of |
     Mother |
   recode 8 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         69        0.69        0.69
          2 |      2,128       21.28       21.97
          3 |      3,080       30.80       52.77
          4 |      2,475       24.75       77.52
          5 |      1,562       15.62       93.14
          6 |        545        5.45       98.59
          7 |        133        1.33       99.92
          8 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015