Frequencies for first 10,000 rows of birwt3 variable in natl1980 dataset :

Birthweight |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        715        7.15        7.15
          2 |      9,276       92.76       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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