Frequencies for first 10,000 rows of mage12 variable in natl1995 dataset :

     Age of |
     Mother |
  recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         55        0.55        0.55
          3 |        105        1.05        1.60
          4 |        271        2.71        4.31
          5 |        364        3.64        7.95
          6 |        466        4.66       12.61
          7 |        601        6.01       18.62
          8 |      3,041       30.41       49.03
          9 |      2,641       26.41       75.44
         10 |      1,740       17.40       92.84
         11 |        608        6.08       98.92
         12 |        102        1.02       99.94
         13 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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