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

       SRV: |
 OUTPATIENT |
    SURGERY |
       UNIT |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |        608        6.08       92.46
          1 |        685        6.85       99.31
          2 |         38        0.38       99.69
          3 |         31        0.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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