Frequencies for first 10,000 rows of ordperf2 variable in nhamcsopd2002 dataset :

       surg |
  procedure |
       #2 - |
  ord/sched |
   or perf? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,894       98.94       98.94
          1 |         29        0.29       99.23
          2 |         60        0.60       99.83
          9 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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