Frequencies for first 10,000 rows of mager variable in natl2015 dataset :

   Mother's |
     Single |
   Years of |
  Age 12 10 |
-- 12 years |      Freq.     Percent        Cum.
------------+-----------------------------------
         13 |          1        0.01        0.01
         14 |          1        0.01        0.02
         15 |         15        0.15        0.17
         16 |         31        0.31        0.48
         17 |         81        0.81        1.29
         18 |        153        1.53        2.82
         19 |        325        3.25        6.07
         20 |        336        3.36        9.43
         21 |        404        4.04       13.47
         22 |        497        4.97       18.44
         23 |        572        5.72       24.16
         24 |        624        6.24       30.40
         25 |        600        6.00       36.40
         26 |        616        6.16       42.56
         27 |        651        6.51       49.07
         28 |        656        6.56       55.63
         29 |        609        6.09       61.72
         30 |        587        5.87       67.59
         31 |        575        5.75       73.34
         32 |        515        5.15       78.49
         33 |        447        4.47       82.96
         34 |        415        4.15       87.11
         35 |        318        3.18       90.29
         36 |        264        2.64       92.93
         37 |        199        1.99       94.92
         38 |        167        1.67       96.59
         39 |        128        1.28       97.87
         40 |         84        0.84       98.71
         41 |         49        0.49       99.20
         42 |         34        0.34       99.54
         43 |         28        0.28       99.82
         44 |          9        0.09       99.91
         45 |          4        0.04       99.95
         46 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016