Frequencies for first 10,000 rows of mager14 variable in natlterr2012 dataset :

   Mother's |
 Age Recode |
     14 U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         23        0.23        0.23
          3 |         39        0.39        0.62
          4 |        123        1.23        1.85
          5 |        217        2.17        4.02
          6 |        387        3.87        7.89
          7 |        527        5.27       13.16
          8 |      2,963       29.63       42.79
          9 |      2,479       24.79       67.58
         10 |      2,011       20.11       87.69
         11 |        949        9.49       97.18
         12 |        272        2.72       99.90
         13 |          7        0.07       99.97
         14 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 5 May 2016