Frequencies for first 10,000 rows of op_srvc_cd variable in pos1992 dataset :

       srv: |
 outpatient |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,851       88.51       88.51
          0 |        253        2.53       91.04
          1 |        830        8.30       99.34
          2 |         27        0.27       99.61
          3 |         39        0.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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