Frequencies for first 10,000 rows of prov2285 variable in pos1993 dataset :

  srv: open |
      heart |
    surgery |
   facility |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,856       88.56       88.56
          0 |        903        9.03       97.59
          1 |        181        1.81       99.40
          2 |         54        0.54       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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