Frequencies for first 10,000 rows of incdrain variable in nhamcsed2009 dataset :

   incision |
        and |
   drainage |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,901       99.01       99.01
          1 |         99        0.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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