Frequencies for first 10,000 rows of bcbs variable in namcs1996 dataset :

       blue |
 cross/blue |
     shield |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,311       83.11       83.11
          1 |      1,689       16.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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