Frequencies for first 10,000 rows of birwt12 variable in natl1996 dataset :

Birthweight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         30        0.30        0.30
          2 |         73        0.73        1.03
          3 |         86        0.86        1.89
          4 |        182        1.82        3.71
          5 |        547        5.47        9.18
          6 |      1,802       18.02       27.20
          7 |      3,684       36.84       64.04
          8 |      2,718       27.18       91.22
          9 |        731        7.31       98.53
         10 |        116        1.16       99.69
         11 |         24        0.24       99.93
         12 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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