Frequencies for first 10,000 rows of incdrain variable in nhamcsed2007 dataset :

   incision |
        and |
   drainage |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,895       98.95       98.95
        yes |        105        1.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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