Frequencies for first 10,000 rows of birwt4 variable in natl1990 dataset :

Birthweight |
   Recode 4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        134        1.34        1.34
          2 |        651        6.51        7.85
          3 |      9,205       92.05       99.90
          4 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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