Frequencies for first 10,000 rows of op_srgry_unit_srvc_cd variable in pos1997 dataset :

       srv: |
 outpatient |
    surgery |
       unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,792       87.92       87.92
          0 |        560        5.60       93.52
          1 |        602        6.02       99.54
          2 |         31        0.31       99.85
          3 |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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