Frequencies for first 10,000 rows of hpvdna variable in namcs2011 dataset :

        HPV |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,977       99.77       99.77
        Yes |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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