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

sigmoidosco |
py/colonosc |
        opy |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,871       98.71       98.71
        yes |        129        1.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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