Frequencies for first 10,000 rows of mager variable in natl2010 dataset :

   Mother's |
Single Year |
 of Age U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
         14 |          3        0.03        0.03
         15 |         19        0.19        0.22
         16 |         66        0.66        0.88
         17 |        138        1.38        2.26
         18 |        225        2.25        4.51
         19 |        391        3.91        8.42
         20 |        532        5.32       13.74
         21 |        542        5.42       19.16
         22 |        603        6.03       25.19
         23 |        600        6.00       31.19
         24 |        639        6.39       37.58
         25 |        607        6.07       43.65
         26 |        603        6.03       49.68
         27 |        606        6.06       55.74
         28 |        582        5.82       61.56
         29 |        587        5.87       67.43
         30 |        573        5.73       73.16
         31 |        473        4.73       77.89
         32 |        414        4.14       82.03
         33 |        392        3.92       85.95
         34 |        285        2.85       88.80
         35 |        264        2.64       91.44
         36 |        183        1.83       93.27
         37 |        165        1.65       94.92
         38 |        137        1.37       96.29
         39 |        121        1.21       97.50
         40 |        101        1.01       98.51
         41 |         55        0.55       99.06
         42 |         41        0.41       99.47
         43 |         24        0.24       99.71
         44 |         13        0.13       99.84
         45 |          8        0.08       99.92
         47 |          1        0.01       99.93
         48 |          3        0.03       99.96
         49 |          2        0.02       99.98
         50 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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