Frequencies for first 10,000 rows of uld_anest variable in natl2005 dataset :

 Anesthetic |
Complicatio |
       ns U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          3        0.03        0.03
          2 |      9,878       98.78       98.81
          9 |        119        1.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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