Frequencies for first 10,000 rows of cbc variable in nhamcsopd2001 dataset :

        cbc |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,643       86.43       86.43
          1 |      1,357       13.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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