Frequencies for first 10,000 rows of papconv variable in nhamcsopd2009 dataset :

      pap - |
conventiona |
          l |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,898       98.98       98.98
        yes |        102        1.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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