Frequencies for first 10,000 rows of mage36 variable in natl1971 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         54        0.54        0.54
          2 |        151        1.51        2.05
          3 |        305        3.05        5.10
          4 |        481        4.81        9.91
          5 |        607        6.07       15.98
          6 |        765        7.65       23.63
          7 |        838        8.38       32.01
          8 |        787        7.87       39.88
          9 |        757        7.57       47.45
         10 |        801        8.01       55.46
         11 |        721        7.21       62.67
         12 |        549        5.49       68.16
         13 |        521        5.21       73.37
         14 |        448        4.48       77.85
         15 |        409        4.09       81.94
         16 |        303        3.03       84.97
         17 |        264        2.64       87.61
         18 |        207        2.07       89.68
         19 |        202        2.02       91.70
         20 |        163        1.63       93.33
         21 |        120        1.20       94.53
         22 |        115        1.15       95.68
         23 |         72        0.72       96.40
         24 |         71        0.71       97.11
         25 |         82        0.82       97.93
         26 |         62        0.62       98.55
         27 |         49        0.49       99.04
         28 |         35        0.35       99.39
         29 |         30        0.30       99.69
         30 |         17        0.17       99.86
         31 |          8        0.08       99.94
         32 |          4        0.04       99.98
         33 |          1        0.01       99.99
         35 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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