Frequencies for first 10,000 rows of bcbs variable in namcs1995 dataset :

       blue |
 cross/blue |
     shield |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,375       83.75       83.75
          1 |      1,625       16.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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