Frequencies for first 10,000 rows of hivtest variable in nhamcsed2012 dataset :

   HIV test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,926       99.26       99.26
        Yes |         74        0.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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