Frequencies for first 10,000 rows of mager variable in natlterr2011 dataset :

   Mother's |
Single Year |
 of Age U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
         12 |          1        0.01        0.01
         13 |          3        0.03        0.04
         14 |         19        0.19        0.23
         15 |         61        0.61        0.84
         16 |        154        1.54        2.38
         17 |        281        2.81        5.19
         18 |        390        3.90        9.09
         19 |        509        5.09       14.18
         20 |        611        6.11       20.29
         21 |        582        5.82       26.11
         22 |        605        6.05       32.16
         23 |        564        5.64       37.80
         24 |        580        5.80       43.60
         25 |        555        5.55       49.15
         26 |        534        5.34       54.49
         27 |        444        4.44       58.93
         28 |        483        4.83       63.76
         29 |        507        5.07       68.83
         30 |        464        4.64       73.47
         31 |        400        4.00       77.47
         32 |        412        4.12       81.59
         33 |        294        2.94       84.53
         34 |        296        2.96       87.49
         35 |        279        2.79       90.28
         36 |        219        2.19       92.47
         37 |        187        1.87       94.34
         38 |        148        1.48       95.82
         39 |        148        1.48       97.30
         40 |        100        1.00       98.30
         41 |         59        0.59       98.89
         42 |         43        0.43       99.32
         43 |         31        0.31       99.63
         44 |         16        0.16       99.79
         45 |         13        0.13       99.92
         46 |          5        0.05       99.97
         47 |          2        0.02       99.99
         48 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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