Frequencies for first 10,000 rows of incdrain variable in nhamcsed2008 dataset :

   incision |
        and |
   drainage |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,886       98.86       98.86
        yes |        114        1.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016