Frequencies for first 10,000 rows of bcbs variable in nhamcsed1995 dataset :

       blue |
 cross/blue |
     shield |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,970       89.70       89.70
          1 |      1,030       10.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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