Frequencies for first 10,000 rows of mage36 variable in natl1990 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         46        0.46        0.46
          2 |        107        1.07        1.53
          3 |        220        2.20        3.73
          4 |        371        3.71        7.44
          5 |        519        5.19       12.63
          6 |        623        6.23       18.86
          7 |        602        6.02       24.88
          8 |        638        6.38       31.26
          9 |        604        6.04       37.30
         10 |        637        6.37       43.67
         11 |        636        6.36       50.03
         12 |        614        6.14       56.17
         13 |        619        6.19       62.36
         14 |        572        5.72       68.08
         15 |        553        5.53       73.61
         16 |        504        5.04       78.65
         17 |        440        4.40       83.05
         18 |        349        3.49       86.54
         19 |        312        3.12       89.66
         20 |        256        2.56       92.22
         21 |        198        1.98       94.20
         22 |        186        1.86       96.06
         23 |        125        1.25       97.31
         24 |         98        0.98       98.29
         25 |         67        0.67       98.96
         26 |         34        0.34       99.30
         27 |         33        0.33       99.63
         28 |         18        0.18       99.81
         29 |         11        0.11       99.92
         30 |          5        0.05       99.97
         31 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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