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

      blood |
    culture |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,400       94.00       94.00
        yes |        600        6.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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