Frequencies for first 10,000 rows of sigcolon variable in namcs2011 dataset :

Sigmoidosco |
py/colonosc |
        opy |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,888       98.88       98.88
        Yes |        112        1.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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