Frequencies for first 10,000 rows of op_srvc_cd variable in pos1996 dataset :

       srv: |
 outpatient |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,803       88.03       88.03
          0 |        248        2.48       90.51
          1 |        873        8.73       99.24
          2 |         30        0.30       99.54
          3 |         46        0.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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