Frequencies for first 10,000 rows of sigcolon variable in nhamcsopd2011 dataset :

Sigmoidosco |
py/colonosc |
        opy |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,913       99.13       99.13
        Yes |         87        0.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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