Frequencies for first 10,000 rows of op_srvc_cd variable in pos2007 dataset :

       srv: |
 outpatient |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,682       86.82       86.82
          0 |        282        2.82       89.64
          1 |        943        9.43       99.07
          2 |         31        0.31       99.38
          3 |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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