Frequencies for first 10,000 rows of prov2285 variable in pos1997 dataset :

  srv: open |
      heart |
    surgery |
   facility |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,792       87.92       87.92
          0 |        956        9.56       97.48
          1 |        197        1.97       99.45
          2 |         50        0.50       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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