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

      rapid |
flu/influen |
    za test |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,863       98.63       98.63
        yes |        137        1.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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