Frequencies for first 10,000 rows of mager variable in natlterr2007 dataset :

   Mother's |
Single Year |
 of Age U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
         12 |          3        0.03        0.03
         13 |          3        0.03        0.06
         14 |         19        0.19        0.25
         15 |         59        0.59        0.84
         16 |        144        1.44        2.28
         17 |        274        2.74        5.02
         18 |        381        3.81        8.83
         19 |        483        4.83       13.66
         20 |        574        5.74       19.40
         21 |        537        5.37       24.77
         22 |        545        5.45       30.22
         23 |        558        5.58       35.80
         24 |        536        5.36       41.16
         25 |        573        5.73       46.89
         26 |        537        5.37       52.26
         27 |        546        5.46       57.72
         28 |        533        5.33       63.05
         29 |        476        4.76       67.81
         30 |        481        4.81       72.62
         31 |        410        4.10       76.72
         32 |        389        3.89       80.61
         33 |        370        3.70       84.31
         34 |        323        3.23       87.54
         35 |        274        2.74       90.28
         36 |        249        2.49       92.77
         37 |        185        1.85       94.62
         38 |        167        1.67       96.29
         39 |        129        1.29       97.58
         40 |         92        0.92       98.50
         41 |         56        0.56       99.06
         42 |         28        0.28       99.34
         43 |         33        0.33       99.67
         44 |         17        0.17       99.84
         45 |          5        0.05       99.89
         46 |          4        0.04       99.93
         47 |          1        0.01       99.94
         48 |          1        0.01       99.95
         49 |          3        0.03       99.98
         50 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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