Frequencies for first 10,000 rows of mager variable in natlterr2005 dataset :

   Mother's |
Single Year |
 of Age U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
         13 |          3        0.03        0.03
         14 |         23        0.23        0.26
         15 |         64        0.64        0.90
         16 |        171        1.71        2.61
         17 |        252        2.52        5.13
         18 |        364        3.64        8.77
         19 |        464        4.64       13.41
         20 |        479        4.79       18.20
         21 |        523        5.23       23.43
         22 |        565        5.65       29.08
         23 |        591        5.91       34.99
         24 |        593        5.93       40.92
         25 |        599        5.99       46.91
         26 |        576        5.76       52.67
         27 |        547        5.47       58.14
         28 |        496        4.96       63.10
         29 |        522        5.22       68.32
         30 |        399        3.99       72.31
         31 |        428        4.28       76.59
         32 |        393        3.93       80.52
         33 |        383        3.83       84.35
         34 |        307        3.07       87.42
         35 |        269        2.69       90.11
         36 |        237        2.37       92.48
         37 |        198        1.98       94.46
         38 |        171        1.71       96.17
         39 |        135        1.35       97.52
         40 |        101        1.01       98.53
         41 |         62        0.62       99.15
         42 |         42        0.42       99.57
         43 |         27        0.27       99.84
         44 |          6        0.06       99.90
         45 |          6        0.06       99.96
         46 |          3        0.03       99.99
         50 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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