Frequencies for first 10,000 rows of mage36 variable in natl1988 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         53        0.53        0.53
          2 |        115        1.15        1.68
          3 |        241        2.41        4.09
          4 |        375        3.75        7.84
          5 |        502        5.02       12.86
          6 |        584        5.84       18.70
          7 |        623        6.23       24.93
          8 |        588        5.88       30.81
          9 |        642        6.42       37.23
         10 |        698        6.98       44.21
         11 |        682        6.82       51.03
         12 |        666        6.66       57.69
         13 |        604        6.04       63.73
         14 |        540        5.40       69.13
         15 |        514        5.14       74.27
         16 |        517        5.17       79.44
         17 |        417        4.17       83.61
         18 |        375        3.75       87.36
         19 |        321        3.21       90.57
         20 |        240        2.40       92.97
         21 |        201        2.01       94.98
         22 |        152        1.52       96.50
         23 |        114        1.14       97.64
         24 |         88        0.88       98.52
         25 |         59        0.59       99.11
         26 |         33        0.33       99.44
         27 |         28        0.28       99.72
         28 |         17        0.17       99.89
         29 |          6        0.06       99.95
         30 |          3        0.03       99.98
         31 |          1        0.01       99.99
         35 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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