Frequencies for first 10,000 rows of op_srvc_cd variable in pos2009 dataset :

       SRV: |
 OUTPATIENT |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |        308        3.08       89.46
          1 |        950        9.50       98.96
          2 |         34        0.34       99.30
          3 |         70        0.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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