Frequencies for first 10,000 rows of mager variable in natl2017 dataset :

   Mother's |
     Single |
   Years of |
  Age 12 10 |
-- 12 years |      Freq.     Percent        Cum.
------------+-----------------------------------
         12 |          1        0.01        0.01
         14 |          4        0.04        0.05
         15 |         10        0.10        0.15
         16 |         23        0.23        0.38
         17 |         74        0.74        1.12
         18 |        130        1.30        2.42
         19 |        234        2.34        4.76
         20 |        331        3.31        8.07
         21 |        391        3.91       11.98
         22 |        424        4.24       16.22
         23 |        500        5.00       21.22
         24 |        517        5.17       26.39
         25 |        622        6.22       32.61
         26 |        632        6.32       38.93
         27 |        687        6.87       45.80
         28 |        632        6.32       52.12
         29 |        662        6.62       58.74
         30 |        556        5.56       64.30
         31 |        564        5.64       69.94
         32 |        547        5.47       75.41
         33 |        474        4.74       80.15
         34 |        469        4.69       84.84
         35 |        404        4.04       88.88
         36 |        302        3.02       91.90
         37 |        231        2.31       94.21
         38 |        170        1.70       95.91
         39 |        133        1.33       97.24
         40 |        100        1.00       98.24
         41 |         65        0.65       98.89
         42 |         48        0.48       99.37
         43 |         25        0.25       99.62
         44 |         18        0.18       99.80
         45 |          9        0.09       99.89
         46 |          6        0.06       99.95
         47 |          2        0.02       99.97
         49 |          2        0.02       99.99
         50 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018