Frequencies for first 10,000 rows of papliq variable in nhamcsopd2007 dataset :

      pap - |
     liquid |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,848       98.48       98.48
        yes |        152        1.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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