Frequencies for first 10,000 rows of physn_srvc_cd variable in pos2005 dataset :

       srv: |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,304       93.04       93.04
          1 |        497        4.97       98.01
          2 |        116        1.16       99.17
          3 |         83        0.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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