Frequencies for first 10,000 rows of open_hrt_srgry_srvc_cd variable in pos2007 dataset :

       srv: |
cardio-thor |
       acic |
    surgery |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,682       86.82       86.82
          0 |      1,059       10.59       97.41
          1 |        204        2.04       99.45
          2 |         46        0.46       99.91
          3 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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