Frequencies for first 10,000 rows of pap variable in nhamcsopd2001 dataset :

   pap test |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,446       94.46       94.46
          1 |        554        5.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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