Frequencies for first 10,000 rows of mage36 variable in natlterr2000 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         49        0.49        0.49
          2 |        137        1.37        1.86
          3 |        265        2.65        4.51
          4 |        392        3.92        8.43
          5 |        535        5.35       13.78
          6 |        597        5.97       19.75
          7 |        675        6.75       26.50
          8 |        683        6.83       33.33
          9 |        657        6.57       39.90
         10 |        667        6.67       46.57
         11 |        558        5.58       52.15
         12 |        580        5.80       57.95
         13 |        536        5.36       63.31
         14 |        508        5.08       68.39
         15 |        478        4.78       73.17
         16 |        467        4.67       77.84
         17 |        366        3.66       81.50
         18 |        309        3.09       84.59
         19 |        314        3.14       87.73
         20 |        231        2.31       90.04
         21 |        227        2.27       92.31
         22 |        177        1.77       94.08
         23 |        158        1.58       95.66
         24 |        118        1.18       96.84
         25 |        109        1.09       97.93
         26 |         65        0.65       98.58
         27 |         38        0.38       98.96
         28 |         44        0.44       99.40
         29 |         23        0.23       99.63
         30 |         21        0.21       99.84
         31 |          6        0.06       99.90
         32 |          5        0.05       99.95
         33 |          3        0.03       99.98
         34 |          1        0.01       99.99
         35 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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