Frequencies for first 10,000 rows of bwtr4 variable in natl2004 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        113        1.13        1.13
          2 |        486        4.86        5.99
          3 |      9,379       93.79       99.78
          4 |         22        0.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 21 Jan 2016