Frequencies for first 10,000 rows of msr_cd variable in dbo_vwhqi_hosp_ed dataset :

    Measure |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
      ED_1b |      1,559       15.59       15.59
      ED_2b |      1,559       15.59       31.18
     OP_18b |      1,376       13.76       44.94
      OP_20 |      1,377       13.77       58.71
      OP_21 |      1,376       13.76       72.47
      OP_22 |      1,376       13.76       86.23
      OP_23 |      1,377       13.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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