Frequencies for first 10,000 rows of cbc variable in nhamcsopd2006 dataset :

        cbc |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,859       88.59       88.59
        Yes |      1,141       11.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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