Frequencies for first 10,000 rows of mage15 variable in natl1982 dataset :

     Age of |
     Mother |
  recode 15 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         56        0.56        0.56
          3 |        118        1.18        1.74
          4 |        257        2.57        4.31
          5 |        380        3.80        8.11
          6 |        508        5.08       13.19
          7 |        652        6.52       19.71
          9 |        709        7.09       26.80
         10 |        710        7.10       33.90
         11 |        731        7.31       41.21
         12 |        719        7.19       48.40
         13 |        702        7.02       55.42
         14 |      2,782       27.82       83.24
         15 |      1,266       12.66       95.90
         16 |        345        3.45       99.35
         17 |         65        0.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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