Frequencies for first 10,000 rows of birwt3 variable in natl1977 dataset :

Birthweight |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        762        7.62        7.62
          2 |      9,215       92.15       99.77
          3 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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