Frequencies for first 10,000 rows of ordperf2 variable in namcs2004 dataset :

       surg |
  procedure |
       #2 - |
  ord/sched |
   or perf? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,830       98.30       98.30
          1 |         52        0.52       98.82
          2 |         85        0.85       99.67
          9 |         33        0.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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