Frequencies for first 10,000 rows of prov2285 variable in pos2004 dataset :

  srv: open |
      heart |
    surgery |
   facility |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,766       87.66       87.66
          0 |        987        9.87       97.53
          1 |        194        1.94       99.47
          2 |         49        0.49       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016