Frequencies for first 10,000 rows of physn_srvc_cd variable in pos2000 dataset :

       srv: |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,487       94.87       94.87
          1 |        433        4.33       99.20
          2 |         32        0.32       99.52
          3 |         48        0.48      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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