Frequencies for first 10,000 rows of prov2285 variable in pos1995 dataset :

  srv: open |
      heart |
    surgery |
   facility |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,933       89.33       89.33
          0 |        844        8.44       97.77
          1 |        167        1.67       99.44
          2 |         51        0.51       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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