Frequencies for first 10,000 rows of woundcx variable in nhamcsed2013 dataset :

      Wound |
    culture |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,888       98.88       98.88
        Yes |        112        1.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016