Frequencies for first 10,000 rows of mager variable in natl2008 dataset :

   Mother's |
Single Year |
 of Age U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
         12 |          1        0.01        0.01
         13 |          7        0.07        0.08
         14 |         18        0.18        0.26
         15 |         60        0.60        0.86
         16 |        112        1.12        1.98
         17 |        236        2.36        4.34
         18 |        398        3.98        8.32
         19 |        562        5.62       13.94
         20 |        635        6.35       20.29
         21 |        651        6.51       26.80
         22 |        599        5.99       32.79
         23 |        634        6.34       39.13
         24 |        620        6.20       45.33
         25 |        566        5.66       50.99
         26 |        566        5.66       56.65
         27 |        622        6.22       62.87
         28 |        559        5.59       68.46
         29 |        536        5.36       73.82
         30 |        452        4.52       78.34
         31 |        390        3.90       82.24
         32 |        335        3.35       85.59
         33 |        291        2.91       88.50
         34 |        271        2.71       91.21
         35 |        244        2.44       93.65
         36 |        163        1.63       95.28
         37 |        159        1.59       96.87
         38 |        116        1.16       98.03
         39 |         76        0.76       98.79
         40 |         55        0.55       99.34
         41 |         23        0.23       99.57
         42 |         16        0.16       99.73
         43 |         14        0.14       99.87
         44 |          7        0.07       99.94
         45 |          4        0.04       99.98
         46 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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