Frequencies for first 10,000 rows of mage36 variable in natl1981 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         44        0.44        0.44
          2 |        124        1.24        1.68
          3 |        290        2.90        4.58
          4 |        411        4.11        8.69
          5 |        529        5.29       13.98
          6 |        637        6.37       20.35
          7 |        698        6.98       27.33
          8 |        727        7.27       34.60
          9 |        719        7.19       41.79
         10 |        723        7.23       49.02
         11 |        670        6.70       55.72
         12 |        646        6.46       62.18
         13 |        670        6.70       68.88
         14 |        580        5.80       74.68
         15 |        517        5.17       79.85
         16 |        404        4.04       83.89
         17 |        354        3.54       87.43
         18 |        313        3.13       90.56
         19 |        218        2.18       92.74
         20 |        183        1.83       94.57
         21 |        147        1.47       96.04
         22 |         89        0.89       96.93
         23 |         85        0.85       97.78
         24 |         72        0.72       98.50
         25 |         49        0.49       98.99
         26 |         31        0.31       99.30
         27 |         26        0.26       99.56
         28 |         13        0.13       99.69
         29 |         14        0.14       99.83
         30 |          7        0.07       99.90
         31 |          3        0.03       99.93
         32 |          4        0.04       99.97
         33 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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