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

 Measure ID |      Freq.     Percent        Cum.
------------+-----------------------------------
      OP_10 |      1,666       16.66       16.66
      OP_11 |      1,667       16.67       33.33
      OP_13 |      1,666       16.66       49.99
      OP_14 |      1,667       16.67       66.66
       OP_8 |      1,667       16.67       83.33
       OP_9 |      1,667       16.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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