Frequencies for first 10,000 rows of mage36 variable in natl1983 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         43        0.43        0.43
          2 |        112        1.12        1.55
          3 |        232        2.32        3.87
          4 |        402        4.02        7.89
          5 |        532        5.32       13.21
          6 |        677        6.77       19.98
          7 |        691        6.91       26.89
          8 |        679        6.79       33.68
          9 |        731        7.31       40.99
         10 |        705        7.05       48.04
         11 |        668        6.68       54.72
         12 |        713        7.13       61.85
         13 |        601        6.01       67.86
         14 |        591        5.91       73.77
         15 |        510        5.10       78.87
         16 |        469        4.69       83.56
         17 |        333        3.33       86.89
         18 |        302        3.02       89.91
         19 |        253        2.53       92.44
         20 |        175        1.75       94.19
         21 |        150        1.50       95.69
         22 |        126        1.26       96.95
         23 |         87        0.87       97.82
         24 |         69        0.69       98.51
         25 |         49        0.49       99.00
         26 |         40        0.40       99.40
         27 |         19        0.19       99.59
         28 |         18        0.18       99.77
         29 |         13        0.13       99.90
         30 |          2        0.02       99.92
         31 |          4        0.04       99.96
         32 |          2        0.02       99.98
         33 |          1        0.01       99.99
         34 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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