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

      Rapid |
flu/Influen |
    za test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,843       98.43       98.43
        Yes |        157        1.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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