Frequencies for first 10,000 rows of birwt3 variable in natl1969 dataset :

Birthweight |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        860        8.60        8.60
          2 |      9,065       90.65       99.25
          3 |         75        0.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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