Frequencies for first 10,000 rows of mager variable in natlterr2008 dataset :

   Mother's |
Single Year |
 of Age U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
         13 |          2        0.02        0.02
         14 |         17        0.17        0.19
         15 |         58        0.58        0.77
         16 |        147        1.47        2.24
         17 |        273        2.73        4.97
         18 |        381        3.81        8.78
         19 |        479        4.79       13.57
         20 |        560        5.60       19.17
         21 |        557        5.57       24.74
         22 |        527        5.27       30.01
         23 |        549        5.49       35.50
         24 |        572        5.72       41.22
         25 |        549        5.49       46.71
         26 |        551        5.51       52.22
         27 |        532        5.32       57.54
         28 |        515        5.15       62.69
         29 |        497        4.97       67.66
         30 |        458        4.58       72.24
         31 |        432        4.32       76.56
         32 |        395        3.95       80.51
         33 |        362        3.62       84.13
         34 |        315        3.15       87.28
         35 |        298        2.98       90.26
         36 |        226        2.26       92.52
         37 |        211        2.11       94.63
         38 |        152        1.52       96.15
         39 |        132        1.32       97.47
         40 |         90        0.90       98.37
         41 |         70        0.70       99.07
         42 |         42        0.42       99.49
         43 |         20        0.20       99.69
         44 |         18        0.18       99.87
         45 |          8        0.08       99.95
         46 |          1        0.01       99.96
         47 |          1        0.01       99.97
         48 |          1        0.01       99.98
         50 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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