Frequencies for first 10,000 rows of sigcolon variable in namcs2005 dataset :

sigmoidosco |
py/colonosc |
        opy |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,894       98.94       98.94
          1 |        106        1.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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