Frequencies for first 10,000 rows of sigcolon variable in nhamcsopd2005 dataset :

sigmoidosco |
py/colonosc |
        opy |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,916       99.16       99.16
        yes |         84        0.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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