Frequencies for first 10,000 rows of cbc variable in namcs2007 dataset :

        cbc |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,552       85.52       85.52
        yes |      1,448       14.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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