Frequencies for first 10,000 rows of ccs variable in namcs2008 dataset :

 does practice |
offer cervical |
        cancer |
    screening? |      Freq.     Percent        Cum.
---------------+-----------------------------------
       unknown |         52        0.52        0.52
           yes |      5,354       53.54       54.06
            no |      4,594       45.94      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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