Frequencies for first 10,000 rows of mage36 variable in natl1969 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         63        0.63        0.63
          2 |        126        1.26        1.89
          3 |        283        2.83        4.72
          4 |        444        4.44        9.16
          5 |        647        6.47       15.63
          6 |        769        7.69       23.32
          7 |        822        8.22       31.54
          8 |        839        8.39       39.93
          9 |        799        7.99       47.92
         10 |        654        6.54       54.46
         11 |        592        5.92       60.38
         12 |        552        5.52       65.90
         13 |        555        5.55       71.45
         14 |        456        4.56       76.01
         15 |        351        3.51       79.52
         16 |        300        3.00       82.52
         17 |        271        2.71       85.23
         18 |        247        2.47       87.70
         19 |        224        2.24       89.94
         20 |        171        1.71       91.65
         21 |        158        1.58       93.23
         22 |        115        1.15       94.38
         23 |        122        1.22       95.60
         24 |         87        0.87       96.47
         25 |        113        1.13       97.60
         26 |         72        0.72       98.32
         27 |         64        0.64       98.96
         28 |         43        0.43       99.39
         29 |         28        0.28       99.67
         30 |         11        0.11       99.78
         31 |          7        0.07       99.85
         32 |          7        0.07       99.92
         33 |          2        0.02       99.94
         34 |          3        0.03       99.97
         35 |          1        0.01       99.98
         36 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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