Frequencies for first 10,000 rows of birwt3 variable in natl1986 dataset :

Birthweight |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        750        7.50        7.50
          2 |      9,241       92.41       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016