Frequencies for first 10,000 rows of op_srvc_cd variable in pos2003 dataset :

       srv: |
 outpatient |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,789       87.89       87.89
          0 |        257        2.57       90.46
          1 |        866        8.66       99.12
          2 |         26        0.26       99.38
          3 |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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