Frequencies for first 10,000 rows of physn_srvc_cd variable in pos2017 dataset 

  Services: |
  Physician |
       Code |      Freq.     Percent        Cum.
------------+-----------------------------------
          . |      9,256       92.56       92.56
          1 |        462        4.62       97.18
          2 |        260        2.60       99.78
          3 |         22        0.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 9 Jan 2018