Frequencies for first 10,000 rows of bwtr4 variable in natlterr2007 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         94        0.94        0.94
          2 |        805        8.05        8.99
          3 |      9,034       90.34       99.33
          4 |         67        0.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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