Frequencies for first 10,000 rows of open_hrt_srgry_srvc_cd variable in pos2003 dataset :

  srv: open |
      heart |
    surgery |
   facility |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,789       87.89       87.89
          0 |        966        9.66       97.55
          1 |        194        1.94       99.49
          2 |         47        0.47       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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