Frequencies for first 10,000 rows of birwt4 variable in natlterr2002 dataset :

      Birth |
     Weight |
   Recode 4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        133        1.33        1.33
          2 |        998        9.98       11.31
          3 |      8,866       88.66       99.97
          4 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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