Frequencies for first 10,000 rows of birwt12 variable in natl1993 dataset :

Birthweight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         11        0.11        0.11
          2 |         66        0.66        0.77
          3 |         79        0.79        1.56
          4 |        152        1.52        3.08
          5 |        457        4.57        7.65
          6 |      1,807       18.07       25.72
          7 |      3,661       36.61       62.33
          8 |      2,791       27.91       90.24
          9 |        807        8.07       98.31
         10 |        145        1.45       99.76
         11 |         19        0.19       99.95
         12 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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