Frequencies for first 10,000 rows of pap variable in nhamcsopd1999 dataset :

   pap test |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,486       94.86       94.86
          1 |        514        5.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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