Frequencies for first 10,000 rows of op_srgry_unit_srvc_cd variable in pos1996 dataset :

       srv: |
 outpatient |
    surgery |
       unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,803       88.03       88.03
          0 |        557        5.57       93.60
          1 |        599        5.99       99.59
          2 |         28        0.28       99.87
          3 |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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