Frequencies for first 10,000 rows of anesthe variable in natl1998 dataset :

 Anesthetic |
complicatio |
         ns |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          9        0.09        0.09
          2 |      9,990       99.90       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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