Frequencies for first 10,000 rows of physn_srvc_cd variable in pos2001 dataset :

       srv: |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,458       94.58       94.58
          1 |        437        4.37       98.95
          2 |         55        0.55       99.50
          3 |         50        0.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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