Frequencies for first 10,000 rows of ordperf1 variable in namcs2002 dataset :

  Surg procedure #1 - |
   ord/sched or perf? |      Freq.     Percent        Cum.
----------------------+-----------------------------------
                Blank |      8,877       88.77       88.77
    Ordered/scheduled |        434        4.34       93.11
            Performed |        607        6.07       99.18
              Unknown |         82        0.82      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

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