Frequencies for first 10,000 rows of physn_srvc_cd variable in pos2009 dataset :

       SRV: |
  PHYSICIAN |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,220       92.20       92.20
          1 |        528        5.28       97.48
          2 |        170        1.70       99.18
          3 |         82        0.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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