Frequencies for first 10,000 rows of mage15 variable in natl1985 dataset :

     Age of |
     Mother |
  recode 15 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         53        0.53        0.53
          3 |        126        1.26        1.79
          4 |        216        2.16        3.95
          5 |        346        3.46        7.41
          6 |        539        5.39       12.80
          7 |        614        6.14       18.94
          9 |        661        6.61       25.55
         10 |        723        7.23       32.78
         11 |        670        6.70       39.48
         12 |        669        6.69       46.17
         13 |        734        7.34       53.51
         14 |      2,776       27.76       81.27
         15 |      1,414       14.14       95.41
         16 |        403        4.03       99.44
         17 |         56        0.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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