Frequencies for first 10,000 rows of bloodcx variable in nhamcsed2004 dataset :

      blood |
    culture |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,618       96.18       96.18
        yes |        382        3.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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