Frequencies for first 10,000 rows of ccs variable in namcs2010 dataset :

 does practice |
offer cervical |
        cancer |
    screening? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |     10,000      100.00      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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