Frequencies for first 10,000 rows of mager variable in natl2011 dataset :

   Mother's |
Single Year |
 of Age U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
         13 |          1        0.01        0.01
         14 |          5        0.05        0.06
         15 |         17        0.17        0.23
         16 |         58        0.58        0.81
         17 |        104        1.04        1.85
         18 |        216        2.16        4.01
         19 |        382        3.82        7.83
         20 |        503        5.03       12.86
         21 |        558        5.58       18.44
         22 |        576        5.76       24.20
         23 |        599        5.99       30.19
         24 |        592        5.92       36.11
         25 |        624        6.24       42.35
         26 |        632        6.32       48.67
         27 |        633        6.33       55.00
         28 |        605        6.05       61.05
         29 |        529        5.29       66.34
         30 |        557        5.57       71.91
         31 |        474        4.74       76.65
         32 |        381        3.81       80.46
         33 |        409        4.09       84.55
         34 |        331        3.31       87.86
         35 |        266        2.66       90.52
         36 |        240        2.40       92.92
         37 |        197        1.97       94.89
         38 |        155        1.55       96.44
         39 |        118        1.18       97.62
         40 |         82        0.82       98.44
         41 |         56        0.56       99.00
         42 |         42        0.42       99.42
         43 |         28        0.28       99.70
         44 |         17        0.17       99.87
         45 |          9        0.09       99.96
         46 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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