Frequencies for first 10,000 rows of ccs variable in namcs2009 dataset :

 does practice |
offer cervical |
        cancer |
    screening? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         50        0.50        0.50
       unknown |         20        0.20        0.70
           yes |      5,191       51.91       52.61
            no |      4,739       47.39      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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