Frequencies for first 10,000 rows of open_hrt_srgry_srvc_cd variable in pos1994 dataset :

  srv: open |
      heart |
    surgery |
   facility |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,940       89.40       89.40
          0 |        838        8.38       97.78
          1 |        165        1.65       99.43
          2 |         51        0.51       99.94
          3 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017