Frequencies for msr_cd variable in dbo_vwhqi_hosp_imm dataset :

    Measure |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
     IMM_1a |      4,648       50.00       50.00
      IMM_2 |      4,648       50.00      100.00
------------+-----------------------------------
      Total |      9,296      100.00

by Jean Roth , jroth@nber.org , 16 Nov 2016