Frequencies for first 10,000 rows of hivtest variable in nhamcsed2015 dataset :

   HIV test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,936       99.36       99.36
        Yes |         64        0.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017