Frequencies for first 10,000 rows of birwt12 variable in natl1998 dataset :

Birthweight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         19        0.19        0.19
          2 |         76        0.76        0.95
          3 |        101        1.01        1.96
          4 |        162        1.62        3.58
          5 |        581        5.81        9.39
          6 |      1,855       18.55       27.94
          7 |      3,720       37.20       65.14
          8 |      2,613       26.13       91.27
          9 |        744        7.44       98.71
         10 |        118        1.18       99.89
         11 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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