Frequencies for first 10,000 rows of hpvdna variable in nhamcsopd2006 dataset :

    hpv dna |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,961       99.61       99.61
        Yes |         39        0.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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