Frequencies for first 10,000 rows of mage36 variable in natl1978 dataset :

     Age of |
     Mother |
  recode 36 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         73        0.73        0.73
          2 |        153        1.53        2.26
          3 |        350        3.50        5.76
          4 |        504        5.04       10.80
          5 |        597        5.97       16.77
          6 |        649        6.49       23.26
          7 |        734        7.34       30.60
          8 |        742        7.42       38.02
          9 |        685        6.85       44.87
         10 |        758        7.58       52.45
         11 |        680        6.80       59.25
         12 |        639        6.39       65.64
         13 |        563        5.63       71.27
         14 |        527        5.27       76.54
         15 |        448        4.48       81.02
         16 |        345        3.45       84.47
         17 |        386        3.86       88.33
         18 |        281        2.81       91.14
         19 |        207        2.07       93.21
         20 |        159        1.59       94.80
         21 |        132        1.32       96.12
         22 |         94        0.94       97.06
         23 |         89        0.89       97.95
         24 |         55        0.55       98.50
         25 |         48        0.48       98.98
         26 |         39        0.39       99.37
         27 |         25        0.25       99.62
         28 |         14        0.14       99.76
         29 |          9        0.09       99.85
         30 |          6        0.06       99.91
         31 |          5        0.05       99.96
         32 |          3        0.03       99.99
         33 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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