Frequencies for first 10,000 rows of sigcolon variable in namcs2012 dataset :

      Sigmoidoscopy/colonoscopy recoded |
                               variable |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                     No |      9,869       98.69       98.69
Yes (from procedure write-ins and check |        131        1.31      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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