Frequencies for first 10,000 rows of hivtest variable in namcs2012 dataset :

   HIV test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,951       99.51       99.51
        Yes |         49        0.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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