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

       srv: |
 outpatient |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,940       89.40       89.40
          0 |        228        2.28       91.68
          1 |        768        7.68       99.36
          2 |         26        0.26       99.62
          3 |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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