Frequencies for first 10,000 rows of bwtr4 variable in natlterr2011 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        117        1.17        1.17
          2 |        852        8.52        9.69
          3 |      8,983       89.83       99.52
          4 |         48        0.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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