Frequencies for first 10,000 rows of birwt12 variable in natl1986 dataset :

Birthweight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          7        0.07        0.07
          2 |         46        0.46        0.53
          3 |         64        0.64        1.17
          4 |        150        1.50        2.67
          5 |        483        4.83        7.50
          6 |      1,675       16.75       24.25
          7 |      3,675       36.75       61.00
          8 |      2,837       28.37       89.37
          9 |        887        8.87       98.24
         10 |        149        1.49       99.73
         11 |         18        0.18       99.91
         12 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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