Frequencies for first 10,000 rows of cbc variable in namcs2001 dataset :

        cbc |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,467       94.67       94.67
          1 |        533        5.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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