Frequencies for first 10,000 rows of mager variable in natl2013 dataset :

   Mother's |
Single Year |
 of Age U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
         14 |          6        0.06        0.06
         15 |         22        0.22        0.28
         16 |         39        0.39        0.67
         17 |         86        0.86        1.53
         18 |        166        1.66        3.19
         19 |        323        3.23        6.42
         20 |        389        3.89       10.31
         21 |        514        5.14       15.45
         22 |        571        5.71       21.16
         23 |        565        5.65       26.81
         24 |        582        5.82       32.63
         25 |        658        6.58       39.21
         26 |        591        5.91       45.12
         27 |        641        6.41       51.53
         28 |        635        6.35       57.88
         29 |        585        5.85       63.73
         30 |        622        6.22       69.95
         31 |        504        5.04       74.99
         32 |        455        4.55       79.54
         33 |        421        4.21       83.75
         34 |        357        3.57       87.32
         35 |        325        3.25       90.57
         36 |        248        2.48       93.05
         37 |        192        1.92       94.97
         38 |        165        1.65       96.62
         39 |         84        0.84       97.46
         40 |         90        0.90       98.36
         41 |         64        0.64       99.00
         42 |         40        0.40       99.40
         43 |         25        0.25       99.65
         44 |         14        0.14       99.79
         45 |         11        0.11       99.90
         46 |          6        0.06       99.96
         49 |          1        0.01       99.97
         50 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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