Frequencies for first 10,000 rows of mage36 variable in natl1977 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         89        0.89        0.89
          2 |        158        1.58        2.47
          3 |        373        3.73        6.20
          4 |        526        5.26       11.46
          5 |        599        5.99       17.45
          6 |        771        7.71       25.16
          7 |        770        7.70       32.86
          8 |        720        7.20       40.06
          9 |        743        7.43       47.49
         10 |        708        7.08       54.57
         11 |        628        6.28       60.85
         12 |        647        6.47       67.32
         13 |        554        5.54       72.86
         14 |        482        4.82       77.68
         15 |        429        4.29       81.97
         16 |        393        3.93       85.90
         17 |        319        3.19       89.09
         18 |        207        2.07       91.16
         19 |        205        2.05       93.21
         20 |        136        1.36       94.57
         21 |        118        1.18       95.75
         22 |        104        1.04       96.79
         23 |         74        0.74       97.53
         24 |         73        0.73       98.26
         25 |         46        0.46       98.72
         26 |         33        0.33       99.05
         27 |         31        0.31       99.36
         28 |         29        0.29       99.65
         29 |         16        0.16       99.81
         30 |          8        0.08       99.89
         31 |          7        0.07       99.96
         32 |          1        0.01       99.97
         33 |          2        0.02       99.99
         34 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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