Frequencies for first 10,000 rows of birwt4 variable in natl1989 dataset :

Birthweight |
   Recode 4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        133        1.33        1.33
          2 |        649        6.49        7.82
          3 |      9,213       92.13       99.95
          4 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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