Frequencies for first 10,000 rows of open_hrt_srgry_srvc_cd variable in pos2010 dataset :

       SRV: |
CARDIO-THOR |
       ACIC |
    SURGERY |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,626       86.26       86.26
          0 |      1,100       11.00       97.26
          1 |        213        2.13       99.39
          2 |         45        0.45       99.84
          3 |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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