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

    HPV DNA |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,969       99.69       99.69
        Yes |         31        0.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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