Frequencies for first 10,000 rows of ordperf1 variable in nhamcsopd2001 dataset :

       surg |
  procedure |
       #1 - |
  ord/sched |
   or perf? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,427       94.27       94.27
          1 |        174        1.74       96.01
          2 |        348        3.48       99.49
          9 |         51        0.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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