Frequencies for first 10,000 rows of mage36 variable in natl1991 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         38        0.38        0.38
          2 |         80        0.80        1.18
          3 |        235        2.35        3.53
          4 |        362        3.62        7.15
          5 |        512        5.12       12.27
          6 |        633        6.33       18.60
          7 |        665        6.65       25.25
          8 |        614        6.14       31.39
          9 |        611        6.11       37.50
         10 |        576        5.76       43.26
         11 |        608        6.08       49.34
         12 |        582        5.82       55.16
         13 |        623        6.23       61.39
         14 |        571        5.71       67.10
         15 |        531        5.31       72.41
         16 |        482        4.82       77.23
         17 |        451        4.51       81.74
         18 |        398        3.98       85.72
         19 |        333        3.33       89.05
         20 |        266        2.66       91.71
         21 |        228        2.28       93.99
         22 |        155        1.55       95.54
         23 |        147        1.47       97.01
         24 |        101        1.01       98.02
         25 |         69        0.69       98.71
         26 |         53        0.53       99.24
         27 |         28        0.28       99.52
         28 |         22        0.22       99.74
         29 |         18        0.18       99.92
         30 |          2        0.02       99.94
         31 |          4        0.04       99.98
         33 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015