Frequencies for first 10,000 rows of cbc variable in namcs2002 dataset :

        CBC |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,310       93.10       93.10
        Yes |        690        6.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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