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

       srv: |
 outpatient |
    surgery |
       unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,682       86.82       86.82
          0 |        598        5.98       92.80
          1 |        663        6.63       99.43
          2 |         37        0.37       99.80
          3 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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