Frequencies for first 10,000 rows of cbc variable in namcs2005 dataset :

        cbc |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,739       87.39       87.39
          1 |      1,261       12.61      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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