Frequencies for first 10,000 rows of birwt12 variable in natl1995 dataset :

Birthweight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         16        0.16        0.16
          2 |         57        0.57        0.73
          3 |         88        0.88        1.61
          4 |        185        1.85        3.46
          5 |        484        4.84        8.30
          6 |      1,814       18.14       26.44
          7 |      3,734       37.34       63.78
          8 |      2,679       26.79       90.57
          9 |        781        7.81       98.38
         10 |        144        1.44       99.82
         11 |         16        0.16       99.98
         12 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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