Frequencies for first 10,000 rows of bwtr4 variable in natl2013 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         78        0.78        0.78
          2 |        466        4.66        5.44
          3 |      9,452       94.52       99.96
          4 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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