Frequencies for first 10,000 rows of op_srgry_unit_srvc_cd variable in pos1994 dataset :

       srv: |
 outpatient |
    surgery |
       unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,940       89.40       89.40
          0 |        502        5.02       94.42
          1 |        526        5.26       99.68
          2 |         25        0.25       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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