Frequencies for first 10,000 rows of ip_srgcl_srvc_cd variable in pos2009 dataset :

       SRV: |
   SURGICAL |
SERVICES-IN |
    PATIENT |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |        477        4.77       91.15
          1 |        812        8.12       99.27
          2 |         42        0.42       99.69
          3 |         31        0.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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