Frequencies for first 10,000 rows of mage36 variable in natl1973 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         78        0.78        0.78
          2 |        209        2.09        2.87
          3 |        383        3.83        6.70
          4 |        561        5.61       12.31
          5 |        726        7.26       19.57
          6 |        824        8.24       27.81
          7 |        715        7.15       34.96
          8 |        741        7.41       42.37
          9 |        713        7.13       49.50
         10 |        669        6.69       56.19
         11 |        633        6.33       62.52
         12 |        667        6.67       69.19
         13 |        572        5.72       74.91
         14 |        387        3.87       78.78
         15 |        360        3.60       82.38
         16 |        330        3.30       85.68
         17 |        262        2.62       88.30
         18 |        196        1.96       90.26
         19 |        172        1.72       91.98
         20 |        157        1.57       93.55
         21 |        138        1.38       94.93
         22 |        109        1.09       96.02
         23 |         81        0.81       96.83
         24 |         87        0.87       97.70
         25 |         62        0.62       98.32
         26 |         57        0.57       98.89
         27 |         39        0.39       99.28
         28 |         23        0.23       99.51
         29 |         22        0.22       99.73
         30 |         16        0.16       99.89
         31 |          6        0.06       99.95
         32 |          2        0.02       99.97
         33 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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