Frequencies for first 10,000 rows of sigcolon variable in nhamcsopd2006 dataset :

sigmoidosco |
py/colonosc |
        opy |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,885       98.85       98.85
        Yes |        115        1.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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