Frequencies for first 10,000 rows of mage36 variable in natlterr2002 dataset :

     Age of |
     Mother |
  Recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         62        0.62        0.62
          2 |        106        1.06        1.68
          3 |        252        2.52        4.20
          4 |        386        3.86        8.06
          5 |        497        4.97       13.03
          6 |        592        5.92       18.95
          7 |        627        6.27       25.22
          8 |        673        6.73       31.95
          9 |        665        6.65       38.60
         10 |        674        6.74       45.34
         11 |        628        6.28       51.62
         12 |        580        5.80       57.42
         13 |        513        5.13       62.55
         14 |        498        4.98       67.53
         15 |        473        4.73       72.26
         16 |        417        4.17       76.43
         17 |        378        3.78       80.21
         18 |        338        3.38       83.59
         19 |        297        2.97       86.56
         20 |        267        2.67       89.23
         21 |        222        2.22       91.45
         22 |        208        2.08       93.53
         23 |        173        1.73       95.26
         24 |        115        1.15       96.41
         25 |        102        1.02       97.43
         26 |         87        0.87       98.30
         27 |         73        0.73       99.03
         28 |         44        0.44       99.47
         29 |         21        0.21       99.68
         30 |         20        0.20       99.88
         31 |          8        0.08       99.96
         32 |          3        0.03       99.99
         33 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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