Frequencies for first 10,000 rows of birwt12 variable in natl1994 dataset :

Birthweight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         17        0.17        0.17
          2 |         60        0.60        0.77
          3 |         74        0.74        1.51
          4 |        180        1.80        3.31
          5 |        576        5.76        9.07
          6 |      1,814       18.14       27.21
          7 |      3,558       35.58       62.79
          8 |      2,720       27.20       89.99
          9 |        845        8.45       98.44
         10 |        135        1.35       99.79
         11 |         19        0.19       99.98
         12 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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