Frequencies for first 10,000 rows of mage36 variable in natlterr1999 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         72        0.72        0.72
          2 |        131        1.31        2.03
          3 |        276        2.76        4.79
          4 |        388        3.88        8.67
          5 |        549        5.49       14.16
          6 |        642        6.42       20.58
          7 |        649        6.49       27.07
          8 |        701        7.01       34.08
          9 |        621        6.21       40.29
         10 |        649        6.49       46.78
         11 |        578        5.78       52.56
         12 |        540        5.40       57.96
         13 |        544        5.44       63.40
         14 |        496        4.96       68.36
         15 |        486        4.86       73.22
         16 |        395        3.95       77.17
         17 |        379        3.79       80.96
         18 |        326        3.26       84.22
         19 |        301        3.01       87.23
         20 |        273        2.73       89.96
         21 |        234        2.34       92.30
         22 |        189        1.89       94.19
         23 |        154        1.54       95.73
         24 |        124        1.24       96.97
         25 |         98        0.98       97.95
         26 |         79        0.79       98.74
         27 |         56        0.56       99.30
         28 |         27        0.27       99.57
         29 |         18        0.18       99.75
         30 |         14        0.14       99.89
         31 |          7        0.07       99.96
         32 |          1        0.01       99.97
         33 |          2        0.02       99.99
         34 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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