Frequencies for first 10,000 rows of birwt4 variable in natl1993 dataset :

Birthweight |
   Recode 4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        156        1.56        1.56
          2 |        609        6.09        7.65
          3 |      9,230       92.30       99.95
          4 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015