Frequencies for first 10,000 rows of mage36 variable in natl1972 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         74        0.74        0.74
          2 |        179        1.79        2.53
          3 |        321        3.21        5.74
          4 |        554        5.54       11.28
          5 |        672        6.72       18.00
          6 |        801        8.01       26.01
          7 |        784        7.84       33.85
          8 |        743        7.43       41.28
          9 |        728        7.28       48.56
         10 |        738        7.38       55.94
         11 |        746        7.46       63.40
         12 |        651        6.51       69.91
         13 |        460        4.60       74.51
         14 |        428        4.28       78.79
         15 |        350        3.50       82.29
         16 |        310        3.10       85.39
         17 |        257        2.57       87.96
         18 |        206        2.06       90.02
         19 |        184        1.84       91.86
         20 |        136        1.36       93.22
         21 |        139        1.39       94.61
         22 |        113        1.13       95.74
         23 |        112        1.12       96.86
         24 |         87        0.87       97.73
         25 |         54        0.54       98.27
         26 |         54        0.54       98.81
         27 |         40        0.40       99.21
         28 |         32        0.32       99.53
         29 |         21        0.21       99.74
         30 |          8        0.08       99.82
         31 |         11        0.11       99.93
         32 |          2        0.02       99.95
         33 |          3        0.03       99.98
         35 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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