Frequencies for first 10,000 rows of mage36 variable in natl1987 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         70        0.70        0.70
          2 |        130        1.30        2.00
          3 |        249        2.49        4.49
          4 |        382        3.82        8.31
          5 |        475        4.75       13.06
          6 |        595        5.95       19.01
          7 |        636        6.36       25.37
          8 |        612        6.12       31.49
          9 |        685        6.85       38.34
         10 |        637        6.37       44.71
         11 |        657        6.57       51.28
         12 |        648        6.48       57.76
         13 |        640        6.40       64.16
         14 |        586        5.86       70.02
         15 |        531        5.31       75.33
         16 |        518        5.18       80.51
         17 |        430        4.30       84.81
         18 |        351        3.51       88.32
         19 |        259        2.59       90.91
         20 |        238        2.38       93.29
         21 |        177        1.77       95.06
         22 |        149        1.49       96.55
         23 |        111        1.11       97.66
         24 |         81        0.81       98.47
         25 |         61        0.61       99.08
         26 |         45        0.45       99.53
         27 |         22        0.22       99.75
         28 |         11        0.11       99.86
         29 |          6        0.06       99.92
         30 |          5        0.05       99.97
         31 |          2        0.02       99.99
         35 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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