Frequencies for first 10,000 rows of birwt3 variable in natl1975 dataset :

Birthweight |
   Recode 3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        765        7.65        7.65
          2 |      9,173       91.73       99.38
          3 |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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