Frequencies for first 10,000 rows of mager14 variable in natl2004 dataset :

   Mother's |
 Age Recode |
     14 U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          9        0.09        0.09
          3 |         23        0.23        0.32
          4 |         99        0.99        1.31
          5 |        160        1.60        2.91
          6 |        317        3.17        6.08
          7 |        451        4.51       10.59
          8 |      2,941       29.41       40.00
          9 |      2,636       26.36       66.36
         10 |      2,037       20.37       86.73
         11 |      1,058       10.58       97.31
         12 |        246        2.46       99.77
         13 |         19        0.19       99.96
         14 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 21 Jan 2016