Frequencies for first 10,000 rows of bwtr4 variable in natlterr2009 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        136        1.36        1.36
          2 |        957        9.57       10.93
          3 |      8,893       88.93       99.86
          4 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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