Frequencies for first 10,000 rows of bwtr4 variable in natlterr2008 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         90        0.90        0.90
          2 |        767        7.67        8.57
          3 |      9,110       91.10       99.67
          4 |         33        0.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016