Frequencies for first 10,000 rows of birwt4 variable in natl1994 dataset :

Birthweight |
   Recode 4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        151        1.51        1.51
          2 |        756        7.56        9.07
          3 |      9,091       90.91       99.98
          4 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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