Frequencies for first 10,000 rows of mage36 variable in natlterr2001 dataset :

     Age of |
     Mother |
  Recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         46        0.46        0.46
          2 |        137        1.37        1.83
          3 |        262        2.62        4.45
          4 |        389        3.89        8.34
          5 |        544        5.44       13.78
          6 |        639        6.39       20.17
          7 |        686        6.86       27.03
          8 |        654        6.54       33.57
          9 |        677        6.77       40.34
         10 |        693        6.93       47.27
         11 |        559        5.59       52.86
         12 |        560        5.60       58.46
         13 |        484        4.84       63.30
         14 |        518        5.18       68.48
         15 |        437        4.37       72.85
         16 |        462        4.62       77.47
         17 |        396        3.96       81.43
         18 |        308        3.08       84.51
         19 |        297        2.97       87.48
         20 |        234        2.34       89.82
         21 |        244        2.44       92.26
         22 |        205        2.05       94.31
         23 |        161        1.61       95.92
         24 |        109        1.09       97.01
         25 |         82        0.82       97.83
         26 |         74        0.74       98.57
         27 |         62        0.62       99.19
         28 |         37        0.37       99.56
         29 |         22        0.22       99.78
         30 |          8        0.08       99.86
         31 |         12        0.12       99.98
         33 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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