Frequencies for first 10,000 rows of birwt12 variable in natl1983 dataset :

Birthweight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          5        0.05        0.05
          2 |         58        0.58        0.63
          3 |         62        0.62        1.25
          4 |        153        1.53        2.78
          5 |        488        4.88        7.66
          6 |      1,752       17.52       25.18
          7 |      3,577       35.77       60.95
          8 |      2,822       28.22       89.17
          9 |        884        8.84       98.01
         10 |        172        1.72       99.73
         11 |         22        0.22       99.95
         12 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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