Frequencies for first 10,000 rows of op_srgry_unit_srvc_cd variable in pos1999 dataset :

       srv: |
 outpatient |
    surgery |
       unit |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,885       88.85       88.85
          0 |        528        5.28       94.13
          1 |        545        5.45       99.58
          2 |         28        0.28       99.86
          3 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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